Add remote-mail page

pages/remote-mail.md

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+<!--
+title: Remote Mail
+author: Charadon
+description: How to connect to your tilde.institute e-mail address remotely.
+-->
+
+# Remote Mail Guide
+tilde.institute doesn't support POP or IMAP at the moment, so we'll need to use
+a little bit of a roundabout way of connecting to our mail address remotely.
+All you will need for this guide is sshfs, ssh itself, and an e-mail client
+that supports Maildir.
+
+## Known clients that support Maildir
+- Gnome Evolution
+- Neomutt
+- Mutt
+
+## Sending Mail
+
+To send mail, all you need to do is run this command:
+
+```
+ssh -nNTL 25:localhost:25 yourusername@tilde.institute
+```
+
+And then set your SMTP server in your mail client to localhost and use port 25.
+You will now be able to send mail.
+
+## Receiving Mail
+First, you need to mount your remote Maildir folder using sshfs. You can use
+this command to do that:
+
+```
+sshfs -v -o reconnect -o ssh_command="ssh -i ~/.ssh/id_yourkey" yourusername@tilde.institute:/home/yourusername/Maildir ~/Maildir
+```
+
+Then set up your mail client like you would with any other Maildir and point it
+to your mounted Maildir folder.
+
+### Notes
+1. This is not very mobile unfortunately, and as far as i'm aware, there is no
+Maildir supporting e-mail client for phones.
+2. The above commands assume you have a keyring installed to automatically
+unlock your keys OR a passwordless key.
+3. On some file managers such as Thunar, if sshfs can't connect to the remote
+server, it will freeze the file manager if you navigate to the folder it's
+mounted in. (In this case, since we mounted Maildir to ~/, it'll freeze in
+your home folder.)