Change folder structure and clean up

7 files changed, 3 insertions, 853 deletions

diff --git a/config.toml b/config.toml
index 4450045..42600c8 100644
--- a/config.toml
+++ b/config.toml
@@ -1,6 +1,5 @@
 # The URL the site will be built for
 base_url = "https://prefet.ch"
-
 title = "Prefetch"
 
 # Whether to automatically compile all Sass files in the sass directory
@@ -15,7 +14,3 @@ build_search_index = false
 
 # Put all your custom variables here
 [extra]
-sections = [
-	{ url = "/articles/", name = "Articles" },
-	{ url = "/software/", name = "Software" },
-]
diff --git a/content/articles/2019-email-server-tutorial.md b/content/articles/2019-email-server-tutorial.md
deleted file mode 100644
index cca8379..0000000
--- a/content/articles/2019-email-server-tutorial.md
+++ /dev/null
@@ -1,612 +0,0 @@
-+++
-title = "How to set up an email server in 2019"
-+++
-
-# How to set up an email server in 2019
-
-This is a guide to set up your own email server in 2019.
-This is a messy topic, and the available documentation is even messier,
-so I compiled this guide in an attempt to make it all more accessible.
-
-So why run your own mail server? There are many reasons,
-ranging from privacy concerns about popular providers,
-to simply wanting to learn about this stuff for fun.
-If you've arrived here, then I assume you've already found a reason.
-
-But beware that this is not for the faint of heart:
-email is a horribly designed system, and even if you manage
-to set up your own server, you may find that GMail flags all
-your messages as spam, with little you can do about it.
-This guide tries to implement all the security measures
-that GMail seems to like, but *your mileage may vary*.
-
-
-
-## How email works
-
-The program on your device that you use to read and send emails
-contains both a Mail User Agent (MUA) and a Mail Retrieval Agent (MRA),
-although in practice the MRA is also often referred to as an MUA.
-These mail agents can be in a dedicated app like [Thunderbird](https://www.thunderbird.net/en-US/)
-or Microsoft Outlook, or it can simply be a web interface.
-
-When you check your inbox, your MRA asks for any new emails
-from the server, which then sends them via the [IMAP](https://en.wikipedia.org/wiki/Internet_Message_Access_Protocol) protocol
-(we ignore [POP3](https://en.wikipedia.org/wiki/Post_Office_Protocol), since it is rather [outdated](https://www.pop2imap.com/)).
-The server-side program here is simply called the IMAP server,
-which watches over the server's copy of your inbox.
-
-When you send an email, your MUA passes it along to the server's
-Mail Submission Agent (MSA), which then immediately hands it over
-to the Mail Transfer Agent (MTA) running on that same server.
-In practice, the MSA's functionality is often regarded as part of the MTA.
-
-The MTA then works out where your email needs to go,
-and sends it over a protocol called [SMTP](https://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol)
-to the MTA of the server responsible for the recipient of your message.
-In complex networks there may be multiple MTAs in a chain.
-
-The final receiving MTA then hands over your email to the
-Mail Delivery Agent (MDA) running on that same server.
-The MDA checks whether it's spam, and then writes it to the server's storage,
-which is being watched over by an IMAP server, thus completing the cycle.
-Most MTA programs also have MDA features for simplicity,
-although in this guide we'll be using our IMAP server's MDA helper.
-
-Long story short, the server we want to set up
-must at least be running both an MTA for you to send emails
-and an IMAP server for you to check your inbox,
-one of which should also include MDA functionality.
-
-
-
-## Email security
-
-This messy base email system is horribly insecure on its own,
-so we still need to tack on some more messy features.
-In this context, "security" refers to both spam and privacy protection.
-This guide covers all techniques mentioned here.
-
-Spam protection also means two things:
-defending yourself against spammers, and
-preventing that your emails' recipients' filters don't flag *you* as a spammer.
-The former is optional, but the latter is not.
-
-Let's start with how to come across as a trustworthy mail server:
-
-The first feature is [Sender Policy Framework](https://en.wikipedia.org/wiki/Sender_Policy_Framework) (SPF),
-which stops a spammer from filling in your email address
-in the "sender" field of their message.
-You do this by publishing a policy in a DNS record for how your domain
-should relate to the IP address of your email server.
-A filter enforcing SPF will use that to check that your server
-is authorized to send messages with your email address.
-
-Then there's [DomainKeys Identified Mail](https://en.wikipedia.org/wiki/DomainKeys_Identified_Mail) (DKIM),
-which is a more comprehensive form of SPF.
-It adds a cryptographic signature to all your emails,
-which the receiver's spam filter will check against
-the contents and a public key you need to publish in a DNS record.
-You should implement *both* SPF and DKIM, despite their overlap.
-
-Lastly, we have [Domain-based Message Authentication, Reporting and Conformance](https://en.wikipedia.org/wiki/DMARC).
-which uses another DNS record to specify whether you're using SPF and/or DKIM,
-and whether super- and subdomains should be regarded as valid for authentication.
-It also gives a contact address to which the receiver should send failure reports.
-I highly recommend implementing this too.
-
-To defend yourself against spammers your server should enforce
-the SPF, DKIM and DMARC policies of senders, in addition to some other checks.
-All of that will be handled by your spam filter.
-
-There's one final problem to bring up:
-your emails will be sent across the Internet unencrypted.
-
-For client-server communication, this is effectively solved
-by IMAPS and SMTPS, which wrap IMAP and SMTP in [TLS](https://en.wikipedia.org/wiki/Transport_Layer_Security).
-To be clear, SMTPS only encrypts email submission by an MUA to an MTA (MSA).
-
-For server-server relaying of messages over SMTP, we have
-STARTTLS, which is a system for opportunistic TLS, meaning that
-communication is only encrypted if both parties agree
-after a short unencrypted discussion.
-That last part is vulnerable to [MitM](https://en.wikipedia.org/wiki/Man-in-the-middle_attack) attacks,
-where anyone along the path of the email servers' discussion
-can alter the exchange to block the use of encryption,
-which sometimes actually [happens](https://www.eff.org/deeplinks/2014/11/starttls-downgrade-attacks) in practice.
-
-The only way to make sure that STARTTLS is used
-is to refuse any emails unless the TLS handshake succeeds.
-That's a risky approach, because fewer mail servers support
-STARTTLS than you might expect or hope: I've had airline
-booking confirmations, full of personal details,
-and made with multi-billion-dollar companies,
-sent across the Internet without any protection.
-I'll show you how, but do it at your own risk.
-
-
-
-## Preparation
-
-Are you still here? Good, let's get started. Here's what you'll need:
-* SSH root access to a 24/7-accessible server running Linux or *BSD
-* an associated domain name for which you can create or edit DNS records
-* a TLS certificate for encryption
-
-The TLS certificate is technically optional,
-but you *really* should use one; it's 2019 for goodness' sake.
-You may get away with using a self-signed certificate,
-but instead I highly recommend getting a proper one from
-[Let's Encrypt](https://letsencrypt.org/) (it's free!).
-
-In the rest of this guide I'll assume that
-you have your public TLS certificate at `/etc/ssl/certs/example.com.pem`,
-and your private encryption key at `/etc/ssl/private/example.com.pem`.
-You should also create a file with [DH parameters](https://weakdh.org/sysadmin.html)
-using the `openssl` tool, included in OpenSSL and LibreSSL:
-```sh
-openssl dhparam -out /etc/ssl/dhparam.pem 4096
-```
-This will take a while, because it's looking for sources
-of randomness in your (very non-random) computer.
-Just keep doing stuff with it running in the background.
-The resulting file is public and expendable.
-
-
-
-There exist many options for most of the software roles described earlier.
-This guide covers multiple options for most of these,
-given here from most to least recommended by me:
-* IMAP server + MDA: [Dovecot](https://www.dovecot.org/).
-* MTA: [OpenSMTPD](https://opensmtpd.org/), [Postfix](http://www.postfix.org/), or [Exim](https://exim.org/).
-* Spam filtering: [Rspamd](https://www.rspamd.com/), or [SpamAssassin](https://spamassassin.apache.org/).
-* DKIM signing: [OpenDKIM](http://www.opendkim.org/), or [DKIMproxy](http://dkimproxy.sourceforge.net/).
-
-The MTA feeds arriving emails through the spam filter
-before giving them to the MDA, which puts them in an inbox folder.
-Likewise, it feeds outgoing emails through the DKIM signer.
-The IMAP server then delivers your inbox contents to your MUA.
-
-All these MTAs include an MDA, but nevertheless
-I recommend using Dovecot's one because it gives the most control.
-This is also important because of how spam filtering works:
-according to the email specification, an MTA assumes full responsibility
-over any emails it accepts for delivery or relaying,
-and promises that it will do its best to get it to its destination.
-
-The takeaway from this is that an MTA must not magically
-swallow any emails it doesn't like, so if it uses a spam filter,
-that filter may tag emails as "spam" or "not spam",
-but the MTA is not allowed to act based on that verdict.
-The MDA does not have this restriction, so only there
-can we make the decision what to do with spam,
-and Dovecot's MDA is by far the best equipped for that.
-
-When setting up an email server, you have the choice between
-attaching email addresses to system users or virtual users.
-With system users, if an email arrives for `foo@example.com`,
-then MTA, MDA and IMAP server will all expect that there
-exists a `foo` Unix user on the server to deliver it to.
-With virtual users, this is not the case.
-
-This guide only covers virtual users, which I recommend
-because it's more flexible, and unless you're using some
-ancient mainframe there is no advantage to using system users.
-
-Therefore, create a global email user and group,
-which are traditionally both called `vmail`.
-Do *not* pass the "system user/group" flags,
-because that will get you into trouble with Dovecot:
-```sh
-# GNU CoreUtils:
-groupadd vmail
-useradd -M -g vmail vmail
-# BusyBox:
-addgroup vmail
-adduser -HD -G vmail vmail
-# *BSD:
-no clue, you can work it out
-```
-
-
-
-
-## DNS records
-
-First things first, you should create an RSA keypair for DKIM,
-which you do using the `openssl` utility again.
-The minimum size is 1024 bits, but I recommend using 2048 bits.
-Bigger is better, but because DNS is involved we can't stretch it
-to 4096 bits without risking causing discomfort to [some](https://serverfault.com/questions/747185/dkim-can-i-use-a-rsa-key-larger-than-2048bit-i-e-4096) servers.
-```sh
-$ openssl genrsa -out /TODO/private.key 2048
-$ openssl rsa -in /path/private.key -out /path/public.key
-```
-
-Now we must set up all the necessary DNS records.
-It may take up to a day for these to propagate over the Internet,
-so I recommend doing this section now and the rest tomorrow.
-
-Now, this might sound obvious, but you must have an A and/or AAAA record
-to associate your domain `example.com` with the server's IP address.
-For email you also must have [reverse DNS](https://en.wikipedia.org/wiki/Reverse_DNS_lookup) set up correctly.
-If you're renting your server remotely, you can often do this from
-the provider's configuration tool, or you can just create a PTR-type DNS record.
-
-To inform the rest of the Internet that your server is an email server,
-create an MX (Mail eXchanger) DNS record for your domain.
-Note the dot at the end of the domain name:
-```
-MX 42 example.com.
-```
-When a message is sent to an email address ending in `@example.com`,
-the sending server will query DNS for any MX records for `example.com`.
-There it will find a domain name (in this case `example.com` again),
-for which it will look up the IP address, and send the email to.
-The domain name in the record must *not* have an associated CNAME record;
-it must be directly translatable to an IP address.
-
-You may have multiple MX records, which must contain different
-domain names, each with an associated preference number (`42` here).
-The sending server will use all MX records with lower numbers first,
-and if those servers are all unavailable, it will try a higher number.
-If you have multiple mail servers (which is good for availability),
-you can therefore declare those as follows:
-```
-MX 13 mx1.example.com.
-MX 42 mx2.example.com.
-```
-Here, a server sending an email to your domain `example.com`
-will try to send it to the IP address of `mx1.example.com` first,
-and if that fails, it will move on to the higher numbered `mx2.example.com`.
-If both `mx1` and `mx2` have the same number, then the sender
-will randomly choose one, which is useful for load balancing.
-
-Next, publish an SPF policy record so you don't look like a spammer.
-This is a TXT (*not* SPF!) record with the following contents:
-```
-TXT "v=spf1 mx -all"
-```
-Everything after the version `v=spf1` is a list of *mechanisms*
-for a spam filter to try out in the given order.
-The `-all` at the end says to reject your email
-if all of the previous mechanisms fail verification.
-I recommend only using the `mx` mechanism, which tells the verifier
-to look at the A/AAAA addresses of the domains in your MX records.
-This allows you to add, remove, or change your servers
-without needing to update this record.
-
-Your DKIM policy must also be published in a TXT record
-as follows, where `<public.key>` is the public RSA key `MI...AB`
-stored in `/TODO/public.key`, with the newlines removed:
-```
-TXT "v=DKIM1; t=s; h=sha256; p=<public.key>"
-```
-Here, `v=DKIM1` is the version and must be the first tag.
-The flag `t=s` enables strict mode, as recommended by the [DKIM spec](https://tools.ietf.org/html/rfc6376#page-29),
-meaning emails sent from subdomains immediately fail verification.
-The optional tag `h=sha256` blocks the use of the old SHA1 algorithm.
-
-Finally, there is the DMARC policy, which, unlike the others,
-will need to be updated at the end of this guide.
-For now, create another TXT record with these contents,
-where `<admin>` is an email address of your choosing,
-which may belong to the domain you're setting up for:
-```
-TXT "v=DMARC1; aspf=s; adkim=s; p=none; sp=reject; fo=1; ruf=mailto:<admin>"
-```
-The version tag `v=DMARC1` is required and must come first.
-Next, `aspf=s` and `adkim=s` enable strict mode for both SPF and DKIM,
-which once again blocks subdomains from passing the test.
-Then `p=none` and `sp=reject` control what to do to failed messages
-coming from the main domain and subdomains, respectively.
-Unsurprisingly, `reject` means that delivery should be refused,
-`none` asks to let it through anyway, and `quarantine` tells
-the filter to take a closer look at the email or to put it in a spam folder.
-Finally, `fo=1` asks the filter to create a forensic report
-if any type of verification fails, and `ruf=` gives an address to send it to.
-
-
-
-## IMAP server: Dovecot
-
-[Dovecot](https://www.dovecot.org/) is a very popular IMAP server,
-focused on being lightweight, simple, and secure.
-Its documentation, while extensive and accurate,
-is an absolute mess: the information you need is
-usually either spread across multiple pages,
-or buried somewhere two internal links deep.
-
-If you installed Dovecot via your package manager,
-you'll probably have a lot of configuration files
-in the `/etc/dovecot` directory and its subdirectories.
-I want you to delete all of them. Yes, `rm -rf` that crap.
-
-Dovecot is simple to configure, and doesn't care where
-you put its settings, so having all that chaos in `/etc/dovecot`
-just makes things unnecessarily confusing.
-
-Create a new blank configuration file `/etc/dovecot/dovecot.conf`,
-and start by filling in the details about your TLS certificate,
-and making clear that unencrypted connections are unacceptable:
-```sh
-ssl = required
-ssl_cert = </etc/ssl/certs/example.com.pem
-ssl_key  = </etc/ssl/private/example.com.key
-ssl_dh   = </etc/ssl/dhparam.pem
-
-ssl_prefer_server_ciphers = yes
-
-disable_plaintext_auth = yes
-```
-The final `disable_plaintext_auth` option tells Dovecot
-to reject any passwords that were sent unencrypted.
-This means it must be [hashed](https://en.wikipedia.org/wiki/Cryptographic_hash_function)
-or sent over a TLS connection, ideally both.
-
-Next, tell Dovecot which protocols to use
-and where to expect them as follows:
-```sh
-protocols = lmtp imap
-
-service lmtp {
-	inet_listener lmtp {
-		address = 127.0.0.1
-		port = 39999
-	}
-	user = vmail
-}
-```
-LMTP is the Local Mail Transport Protocol, which is basically SMTP
-but intended for exchange within a single server or cluster.
-When an email is received, Dovecot will start a child process
-under the `vmail` Unix user to deliver the message to its recipient.
-
-Since we set `ssl = required` earlier, MUAs (MRAs) will only get their mail
-if the STARTTLS handshake was successful during the IMAP exchange,
-or if they connect via IMAPS to force the use of encryption.
-If you want to, you can set Dovecot to only accept IMAPS
-by neutralizing the STARTTLS IMAP login listener:
-```sh
-service imap-login {
-	inet_listener imap {
-		port = 0
-	}
-}
-```
-
-Then we need to inform Dovecot which email users it should handle,
-and what to do with their messages. Create a file `/etc/dovecot/users` for this,
-which describes users in the same format as `/etc/passwd`:
-```
-user:password:uid:gid::homedir
-```
-You can leave `uid` and `gid` fields blank, since we're
-using our `vmail` virtual mail user for all accounts.
-You can even omit `homedir` if all users' directories
-follow the same pattern, for example `/var/vmail/<user>/`.
-The `user` name may contain the ending `@example.com`, but doesn't need to.
-Create the password hash to put in the `password` field as follows:
-```sh
-# If your server is beefy and has lots of RAM:
-doveadm pw -s ARGON2ID-CRYPT
-# If you're using an old potato:
-doveadm pw -s SHA512-CRYPT
-```
-After you've entered your password, simply copy-paste the entire
-hash string outputted by the program into the `password` field.
-
-Dovecot needs a file describing user accounts on two occasions:
-* To check whether a user logging into the IMAP server
-  is valid and has given the right password.
-  This is handled by the `passdb` block(s) in the configuration.
-* To know which email addresses the server is responsible for.
-  This is given by the `userdb` block(s) in the configuration.
-These functions aren't necessarily fulfilled by the same file:
-you can map multiple email addresses to one user acccount,
-or multiple user accounts to one email address.
-For simplicity, though, we'll use the same file:
-```sh
-passdb {
-	driver = passwd-file
-	args = scheme=ARGON2ID-CRYPT username_format=%n /etc/dovecot/users
-	#args = scheme=SHA512-CRYPT username_format=%n /etc/dovecot/users
-}
-
-userdb {
-	driver = passwd-file
-	args = username_format=%n /etc/dovecot/users
-	# Use vmail for all users, and if all users' inboxes have the same form:
-	override_fields = uid=vmail gid=vmail home=/var/vmail/%n
-}
-```
-The `driver` option sets the kind of table Dovecot should expect.
-We tell it to use a file in the `passwd`-like format described above,
-but other common choices include SQL or the actual `/etc/passwd` file.
-The options available in `args` depend on the chosen `driver`.
-
-The password hashing algorithm is given by `scheme`, while
-`username_format` desribes the format of user names in the table:
-if Dovecot receives an email for `someone@example.com`,
-then for `%n` it will expect `someone` in `/etc/dovecot/users`,
-but if you use `%u` it will want the full email address instead.
-
-In the `userdb` block we force the use of `vmail:vmail`
-for all users, and tell Dovecot to put their mail in `/var/vmail/%n`,
-where `%n` means the same as before. You can also use `%u`
-for the full address again, or `%d` for the domain name.
-
-Optionally, you can create a catch-all inbox that will accept
-all emails sent to your domain that don't match anyone in `/etc/dovecot/users`.
-Just add this second `userdb` block after the first:
-```sh
-userdb {
-	driver = static
-	args = uid=vmail gid=vmail home=/var/vmail/catchall allow_all_users=yes
-}
-```
-The `static` driver means there is no table file:
-all configuration is directly within this `userdb` block.
-If we didn't specify `allow_all_users=yes`, then Dovecot
-would check whether users existed using the `passdb` table.
-
-Finally, now that we've told Dovecot where the virtual mail users' `home`
-folders are, we need to specify how to store the emails within them:
-```sh
-mail_location = maildir:~:LAYOUT=fs
-```
-The two standard mailbox formats to choose from are `maildir` and `mbox`.
-I highly recommend `maildir`; it's faster and more flexible than `mbox`
-because it uses folders, whereas the older `mbox` uses a single database file.
-The `~` tells Dovecot to directly put all mails in the account's home folder,
-and `LAYOUT=fs` to user filesystem directories for you email folders. TODO?
-
-
-
-
-
-## MTA: Postfix
-
-
-## MTA: Exim
-
-
-
-## MTA: OpenSMTPD
-
-OpenSMTPD is an MTA by the [OpenBSD](https://www.openbsd.org/) project,
-who are known for their focus on security and minimalism.
-I really like OpenSMTPD's flexible configuration format,
-and its simple and intuitive way of passing around emails.
-
-It doesn't implement milter or any other filtering interface,
-so DKIM signing and spam checking must be shoehorned in.
-As such, only DKIMproxy can be used for DKIM signing.
-
-To begin, write your email domain on a single line in `/etc/smtpd/mailname`:
-```
-example.com
-```
-Next, you must fill in the `/etc/smtpd/aliases` file
-which maps recipient addresses to system users:
-```
-mailuser@example.com    systemuser
-```
-You can create a wildcard (catch-all) address for your domain
-by omitting `mailuser`, such that any unknown recipients end up there.
-You may also specify multiple system users as `systemuser1,systemuser2`.
-
-The first part of the actual config `/etc/smtpd/smtpd.conf` is as follows,
-with DKIMproxy listening on port 19999 and outputting to 20000:
-```sh
-# Register TLS certificate to encrypt email transport:
-pki "example.com" certificate "/etc/ssl/certs/example.com.pem"
-pki "example.com" key "/etc/ssl/private/example.com.key"
-pki "example.com" dhe auto
-
-table users "/etc/smtpd/aliases"
-
-# Relay emails submitted by client to DKIM signer on port 19999:
-listen on eth0 port 465 smtps       pki "example.com" tag SEND
-listen on eth0 port 587 tls-require pki "example.com" tag SEND
-accept tagged SEND from any for any relay via smtp://127.0.0.1:19999
-
-# Relay outgoing DKIM-signed emails to their intended destination:
-listen on lo port 20000 tag DKIM
-accept tagged DKIM from local for any relay
-```
-The lines starting with `pki` enable [DHE](https://en.wikipedia.org/wiki/Diffie%E2%80%93Hellman_key_exchange)
-and tell where the public certificate and private key are for the domain.
-We listen for client emails on both ports 465 (SMTPS) and 587 (SMTP),
-although for the latter we refuse the submission if STARTTLS fails.
-
-If no spam filtering is desired, let OpenSMTPD deliver the email
-by appending the following to the configuration file:
-```sh
-# Receive incoming emails and write them to the inbox:
-listen on eth0 port 25 tls pki "example.com"
-accept from any for domain "example.com" virtual <users> deliver to lmtp rcpt-to as vmail
-```
-Here, we look up which system user corresponds to the recipient in `<users>`,
-and deliver it to their maildir `mail` in their home folder.
-
-
-### With SpamAssassin UNTESTED
-
-For SpamAssassin, we'll need to use [spampd](https://github.com/mpaperno/spampd) as an SMTP shim,
-which we set to listen on port 29999 and relay to port 30000.
-Add the `--nodetach` option in an init script or systemd service,
-but leave it out when starting `spampd` by hand for testing:
-```sh
-$ spampd --host=127.0.0.1:29999 --relayhost=127.0.0.1:30000 [--nodetach]
-```
-The rest of `smtpd`'s configuration is then as follows:
-```sh
-# Receive incoming emails and send them to spampd on port 29999:
-listen on eth0 port 25 tls pki "example.com" tag SCAN
-accept tagged SCAN from any for domain "example.com" relay via smtp://127.0.0.1:29999
-
-# Receive filtered incoming emails and write them to the inbox:
-listen on lo port 30000 tag DONE
-accept tagged DONE from local for any virtual <users> deliver to maildir "~/mail"
-```
-TODO
-
-### With Rspamd
-
-
-
-
-
-
-
-
-
-## DKIM signer: DKIMproxy
-
-[DKIMproxy](http://dkimproxy.sourceforge.net/) is a mature and simple SMTP proxy
-that signs or verifies all emails passed through it
-using the Perl Mail::DKIM module.
-
-In this guide we only use its signing feature,
-which is controlled by `/etc/dkimproxy/dkimproxy_out.conf`.
-This configuration file is pretty self-explanatory:
-```sh
-listen    127.0.0.1:19999
-relay     127.0.0.1:20000
-
-domain    example.com
-selector  mail
-
-keyfile   /etc/dkim/private.key
-signature dkim(c=relaxed/simple,a=rsa-sha256)
-```
-This last line clearly tells it to create a DKIM signature,
-because it also supports DKIM's predecessor, Yahoo! DomainKey.
-The tag `a=rsa-sha256` specifies the signing algorithm,
-while `c=relaxed/simple` gives the [canonicalization](https://tools.ietf.org/html/rfc6376#section-3.4) method.
-
-Canonicalization is a way to prevent the signature from becoming invalid
-as the email might get reformatted by the MTAs on its journey.
-Our choice `relaxed/simple` allows the header to be reformatted (`relaxed`),
-but not the actual body of the message (`simple`).
-
-
-
-
-## DKIM signer: OpenDKIM
-
-[OpenDKIM](http://www.opendkim.org/) is a milter program
-that can both create and verify DKIM signatures.
-
-
-
-
-## Spam filter: Rspamd
-
-
-
-## Spam filter: SpamAssassin
-
-
-
diff --git a/content/articles/_index.md b/content/blog/_index.md
index 1b37a22..1b37a22 100644
--- a/content/articles/_index.md
+++ b/content/blog/_index.md
diff --git a/content/software/_index.md b/content/software/_index.md
deleted file mode 100644
index c244928..0000000
--- a/content/software/_index.md
+++ /dev/null
@@ -1,13 +0,0 @@
-+++
-title = "Software"
-+++
-
-Software made by me:
-* [winvm.sh](winvm.sh): a QEMU-launching shell script
-I used to emulate Windows for gaming. Since
-[Mesa](https://www.mesa3d.org/) has matured so much and
-[Proton](https://github.com/ValveSoftware/Proton/)
-is in great shape, I won't update it anymore.
-* More coming soon!
-
-Apart from that, here's a [list](/software/recommended) of software I recommend.
diff --git a/content/software/recommended.md b/content/software/recommended.md
deleted file mode 100644
index e3efd37..0000000
--- a/content/software/recommended.md
+++ /dev/null
@@ -1,77 +0,0 @@
-+++
-title = "Recommended software"
-+++
-
-# Recommended software
-
-* [Arch Linux](https://www.archlinux.org/),
-  the no-nonsense Linux distribution. It's not perfect,
-  but it has the best reward-to-effort ratio for me.
-  Mainly its spectacular wealth of available packages
-  (11000 main + 53000 AUR!) make it the king.
-* [Alpine Linux](https://alpinelinux.org/),
-  the featherlight distribution powering this server.
-* [Void Linux](https://voidlinux.org/),
-  another nice lightweight distribution. It has
-  a great package management system with good 
-  support for both binary packages and 
-  [Gentoo](https://gentoo.org/)-style
-  customizable source builds.
-* [i3](https://i3wm.org/), a mature, lightweight,
-  responsive tiling window manager without all the fuss.
-  I'll move to its successor-in-progress
-  [Sway](https://swaywm.org/) as soon as I find it mature enough.
-* [Neovim](https://neovim.io/), which I use instead of its
-  venerable ancestor [Vim](https://www.vim.org/) because
-  it's faster, cleaner, and more future-facing
-  ([source](https://geoff.greer.fm/2015/01/15/why-neovim-is-better-than-vim/)).
-  With plugins, of course:
-	+ [vim-plug](https://github.com/junegunn/vim-plug)
-	  for simple and effective plugin management.
-	+ [terminus](https://github.com/wincent/terminus)
-	  to noticeably improve integration with the window manager.
-	+ [onedark.vim](https://github.com/joshdick/onedark.vim),
-	  because it looks great and is easy on the eyes.
-	+ [lightline.vim](https://github.com/itchyny/lightline.vim)
-	  for no real reason. Just eye candy I guess.
-	+ [vim-polyglot](https://github.com/sheerun/vim-polyglot),
-	  because its syntax definitions are much better.
-	+ [vim-sneak](https://github.com/justinmk/vim-sneak)
-	  to make movement less of a hassle.
-* [Alacritty](https://github.com/jwilm/alacritty) as terminal emulator,
-  for its speed, minimalism, ease to configure, and native Wayland support.
-  I used to use [st](https://st.suckless.org/),
-  but it was too annoying to reconfigure.
-* [imv](https://github.com/eXeC64/imv),
-  a command-line image viewer that I've found to be
-  much simpler and snappier than its more popular cousin
-  [feh](https://feh.finalrewind.org/).
-* [zathura](https://git.pwmt.org/pwmt/zathura),
-  a fantastic modular viewer for PDFs and similar formats.
-  It remembers your position in a document after closing or reloading,
-  which is great when using LaTeX, and the main reason
-  I prefer it over [MuPDF](https://mupdf.com/).
-* [mpv](https://mpv.io/), a great terminal-friendly media player.
-  If you have [youtube-dl](https://youtube-dl.org/) installed
-  you can watch videos you would otherwise need a web browser for.
-* [nginx](https://nginx.org/),
-  the most popular HTTP server in the world.
-  And for good reason: it's lightweight, fast, secure,
-  flexible and straightforward to configure.
-* [Zola](https://www.getzola.org/) to generate static webpages,
-  including the one you're reading right now.
-* [QEMU](https://www.qemu.org/),
-  the Swiss army knife of emulation, and a damn fast one at that,
-  albeit with absolutely terrible documentation.
-  My old Windows launch script is [here](../winvm.sh).
-* The [musl](https://www.musl-libc.org/) C standard library,
-  the only one that remembers it's supposed to stick to the
-  official specification rather than pursuing every crazy idea.
-* [BusyBox](https://busybox.net/) bundles the
-  most important Unix tools into one portable ELF.
-* [s6](https://skarnet.org/software/s6/),
-  a nice Unix service manager and init system.
-  I used it in my now long-abandoned
-  [LFS](http://linuxfromscratch.org/lfs/index.html) installation.
-* [doas](https://man.openbsd.org/doas),
-  sudo for the 21st century, this time actually configurable.
diff --git a/content/software/winvm.sh b/content/software/winvm.sh
deleted file mode 100644
index 09283e0..0000000
--- a/content/software/winvm.sh
+++ /dev/null
@@ -1,144 +0,0 @@
-#!/bin/sh
-
-
-# This is the script I used to use to launch QEMU, emulating
-# Windows 8 with direct physical access to a powerful GPU
-# and the Intel audio controller. This isn't a complete guide,
-# more a collection of tips for any other brave people mad
-# enough to try this. Look up "{VFIO,VGA,GPU,PCI} passthrough"
-# if you want to get proper guidance for this.
-
-# This was working on QEMU 2.12, but note that I'm not updating it anymore.
-
-
-# Create hugepage FS. Don't forget to actually populate it
-# with available RAM using kernel boot arguments or sysctl.
-# The user you run QEMU under (not root!) must be in the kvm group.
-sudo mkdir /dev/hugepages
-sudo mount -t hugetlbfs hugetlbfs /dev/hugepages
-sudo chown root:kvm /dev/hugepages
-sudo chmod 1777 /dev/hugepages # Necessary apparently
-
-
-# The block devices you use for the VM are up to you;
-# mine are at /dev/mapper/win{dows,data}.
-# I recommend refreshing udev after you've created them:
-udevadm trigger
-
-
-### USEFUL KERNEL ARGUMENTS
-# intel_iommu=on            : VFIO won't work otherwise. I don't have an AMD CPU,
-#                             but there should be a similar option for that.
-# vfio-pci.ids=XXXX:YYYY,.. : Only available if VFIO is built into the kernel
-#                             (requires custom kernel build). Reserves devices at boot.
-# hugepages=X hugepagesz=Y  : Create X hugepages at boot of size Y ("2M" or "1G").
-# nohugeiomap               : This fixed something, but I can't remember what.
-# intremap=no_x2apic_optout : Some UEFIs don't support the x2apic and disable it.
-#                             This force-enables it. Had no negative consequences for me.
-# pci=pcie_bus_peer2peer    : This was the silver bullet for me, but YMMV.
-# isolcpus=X-Y nohz_full=X-Y rcu_nocbs=X-Y : You MUST use CPU pinning if you add this.
-#                                            X-Y is an inclusive range of CPU cores to
-#                                            to reserve for the vCPUs.
-
-
-### MACHINE OPTIONS
-QEMU="-name debug-threads=on -enable-kvm -machine q35,accel=kvm,kernel_irqchip=on,vmport=off,mem-merge=off"
-# -debug-threads=on : name the vCPU threads, useful for CPU pinning.
-# -enable-kvm       : enable KVM acceleration.
-# -machine q35      : emulate the Q35 chipset, which is closer to a modern PC.
-# accel=kvm         : probably identical to -enable-kvm, but just in case.
-# kernel_irqchip=on : emulate an IRQ chip in the kernel instead of in QEMU.
-# vmport=off        : don't emulate a VMWare I/O port.
-# mem-merge=off     : disable KSM, since there is only one VM.
-
-### CPU OPTIONS
-QEMU="$QEMU -cpu host,kvm=off,hv_time,hv_relaxed,hv_spinlocks=0x1fff,hv_vpindex,hv_reset,hv_runtime,hv_crash,hv_vendor_id=NvidiaFix"
-# -cpu host : use the host CPU instead of emulating one.
-# kvm=off   : don't declare self as KVM to the guest, as Windows doesn't care.
-# hv_*      : pretend to be Hyper-V, so Windows can optimize itself for running as a guest.
-# https://www.reddit.com/r/VFIO/comments/479xnx/guests_with_nvidia_gpus_can_enable_hyperv/
-QEMU="$QEMU -smp sockets=1,cores=4,threads=1"
-# -smp ...  : processor layout to emulate.
-
-### RAM OPTIONS
-QEMU="$QEMU -m 12G -mem-path /dev/hugepages -mem-prealloc"
-# -m x          : amount of guest RAM.
-# -mem-path ... : allocate memory from this pool. Can be a file or "hugepages" (mount -t hugetlbfs).
-# -mem-prealloc : allocate all memory from -mem-path at startup rather than on demand.
-
-### EMULATION OPTIONS
-QEMU="$QEMU -vga none -nodefaults -rtc base=utc,clock=host,driftfix=none"
-# -vga none     : don't emulate a graphics card, since we're using a physical one.
-# -nodefaults   : don't emulate any of the default devices.
-# -rtc base=utc : emulate an RTC starting at host's local time.
-# clock=host    : use the host's accurate clock for VM timekeeping.
-# driftfix=none : don't fix Windows' clock drifting, as that involves injecting interrupts.
-QEMU="$QEMU -drive if=pflash,format=raw,file=/usr/share/edk2-ovmf/OVMF_CODE.fd,readonly"
-QEMU="$QEMU -drive if=pflash,format=raw,file=/usr/share/edk2-ovmf/OVMF_VARS.fd"
-# These options enable using the OVMF virtual UEFI instead of SeaBIOS.
-# The exact file locations might vary; this is for Gentoo.
-
-### PCI PASSTHROUGH
-QEMU="$QEMU -device ioh3420,chassis=1,port=1,multifunction=on,bus=pcie.0,addr=1c.0,id=pcie.1"
-# -device ioh3420      : emulate a PCIe I/O hub to attach the GPU to.
-# chassis=1,port=1     : ?
-# bus=pcie.0,addr=1c.0 : place it at 00:1c.0 on the guest.
-# id=pcie.1            : refer to this device as "pcie.1" below.
-QEMU="$QEMU -device vfio-pci,host=04:00.0,multifunction=on,bus=pcie.1,addr=00.0"
-# GPU VGA controller. 
-# multifunction=on     : this device isn't just a VGA controller.
-# bus=pcie.1,addr=00.0 : attach it to the I/O hub as function 0.
-QEMU="$QEMU -device vfio-pci,host=04:00.1,bus=pcie.1,addr=00.1"
-# GPU HDMI audio controller. 
-# bus=pcie.1,addr=00.1 : attach it to the I/O hub as function 1.
-QEMU="$QEMU -device vfio-pci,host=00:1b.0,bus=pcie.0,addr=1b.0"
-# Intel HDA audio controller. 
-# bus=pcie.0,addr=1b.0 : place the device where Intel usually puts its HDA controller.
-
-#QEMU="$QEMU -device intel-iommu,intremap=on"
-# Expose the IOMMU to the guest too. Probably useless in this case.
-
-### USB PASSTHROUGH
-QEMU="$QEMU -usb"
-# Enable USB support.
-QEMU="$QEMU -device usb-host,vendorid=0xXXXX,productid=0xYYYY"
-# If one of these can't be found, it's simply ignored. Use lsusb to find the IDs.
-
-### STORAGE OPTIONS
-QEMU="$QEMU -drive if=ide,format=raw,discard=unmap,detect-zeroes=unmap,file=/dev