How can I access my POP/IMAP account(s)?
The easiest/ fastest way is to use URL syntax:
pops://email@example.com/ (pop:// - no SSL) imaps://firstname.lastname@example.org/path (imap:// - no SSL)
You can specify them where ever you have to provide a folder name (like "change-folder" or hooks). This includes even your "inbox", see MuttGuide/Folders. This treats them as regular local folders, i.e. for POP you can delete single a message on the server, i.e. it doesn't just POP them off "all or none".
For "once in a while" remote access mutt's built-in support for POP/ IMAP is nice, but for frequent/ high volume POP access MRA like fetchmail are recommended.
How can I configure mutt with IMAP so that I can read a message without large attachments (eg pdf, doc, ppt) being downloaded?
When I access my IMAP server from my android phone using K-9 Mail, I can read a message body without attachments being downloaded. In mutt, I can't figure out how to get this behavior. Instead, my mutt is downloading all the attachments the moment I select a message, which is often a waste of time and bandwidth.
When I use a ssh-tunnel-to-IMAP to my imap server I get error messages …
like connection to 10.0.2.1 closed. or imap_check_capabilities ? When I try to run the tunnel command in my shell everything seems fine. What's going on?!
A proper description of this error can be found at [http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=162859 Debian Bug report logs - #162859]. This issue seems to be related to users using a ssh-tunnel-to-Courier-IMAP. If the user "runs the courier binary directly it sends stderr along with stdout (since it's not being run by courier's standard facilities)"
The Right way http://blog.underdog-projects.net/2008/09/tunnel-your-imap-over-ssh/ of setting a ssh-tunnel-to-Courier-IMAP is
set tunnel="ssh -q mail.example.com /usr/sbin/imapd 2>/dev/null Maildir"
When using dovecot as imap server, try the following tunnel setting:
set tunnel="ssh -q mail.example.com '/usr/sbin/dovecot -c ~/.dovecot.conf --exec-mail imap'"
You'll have to specify an alternative config file with the -c option, since in most cases you won't be able to read system-wide configuration file in /etc/dovecot
How can I save typing long IMAP-pathnames?
If you have just one IMAP account and / or don't need the $folder variable to access local folders or use "~" to do so, then you can store the common path of a single IMAP-server in $folder and use "+" or "=" as a shortcut (see MuttGuide/Folders).
You can specify mailboxes to have more than 1 listed in the mailbox folder-browse mode (change folder, hit '?' twice to find the key to toggle "mailboxes view"). You can use $folder to save typing when specifying them (note to reset it at the end to a sane local value):
set folder=imap://AAA.tld mailboxes +folder1 +folder2 ... set folder=imap://BBB.tld mailboxes +folder1 +folder2 ... ... set folder=~/Mail
Or use macros in the different menus and contexts (changing or saving folders), especially if you have more than 1.
With hooks you can change "$folder" dynamically, get creative.
How can I list/ browse remote IMAP-folders?
As with local folders, you can use TAB to enter folder-browse mode for the change-folder command. Just specify the base directory and let mutt TAB-expand/-browse it for you (MuttGuide/Folders).
You can also define all your IMAP folders as "mailboxes" and then enter "mailboxes" view. For this set "imap_list_subscribed" and "imap_check_subscribed" as desired, then go and actually subscribe your desired folders. Then see /Action about "mailboxes" view.
I'm using only IMAP folders, yet mutt still queries about local folders, why?
Because you probably have forgotten to change one of the settings for MuttGuide/Folders, or you might have specified mailboxes pointing to local folders.
I keep getting disconnected when I leave mutt alone for a few minutes
There is probably a firewall or NAT router between you and your server which drops connections that don't get traffic frequently enough. Mutt by default will send keepalive traffic every 15 minutes, which is well within the IMAP specification (servers are required to hold connections open for 30 minutes).
Unfortunately some routers will drop you after as little as one minute. You can try adjusting $timeout (reducing this polls the current mailbox more often), $mail_check (this controls how frequently other mailboxes are polled), or $imap_keepalive (which controls how often keepalive messages are sent in non-interactive contexts, eg while composing email messages). Lower these until your router stops disconnecting you, but don't make them so low that mutt starts to feel sluggish.
Why do I have to review my server's SSL certificate every single time I connect to it?
Because it's not in the system-wide certificate database. You probably can't do anything about that, but you can set $certificate_file to the path of a file in which to store these unknown certificates. If this is set, you'll see a new option to save certificates permanently the next time you connect. As long as the certificate is valid (e.g. hasn't expired), you shouldn't be nagged about it again.