Mutt

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mutt is a text-based, command-line mail user agent (MUA). mutt is one of the current console-based mail clients that's still under active development and has a vast crowd of active supporters (and users). It is powerful, highly customizable, small, and efficient.

neomutt is a fork of mutt which is very similar, to which most of this article also applies.

Introduction

While Mutt was originally designed to read mail from the local mbox mail spool (e.g. /var/spool/mail/), nowadays it comes with full support for Maildir stored folders, remote fetching from POP3 servers and complete management of IMAP accounts. For a full description of what Mutt can do, please read the Mutt manual.

Installation

Starting your Mutt adventure simply requires you to emerge it. Unfortunately, Mutt has a lots of options, which enable or disable certain functionalities of Mutt. We now briefly discuss the most important USE flags that you may want to enable based on your intended usage of Mutt. Please note that enabling most of them won't harm your Mutt, but may make it do more than an experienced Mutt user would like.

Emerge

root #emerge --ask --verbose mail-client/mutt

USE flags

USE flags for mail-client/mutt A small but very powerful text-based mail client

`autocrypt`	Enable autocrypt.org support
`berkdb`	Enable sys-libs/db database backend for header caching
`debug`	Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see https://wiki.gentoo.org/wiki/Project:Quality_Assurance/Backtraces
`doc`	Add extra documentation (API, Javadoc, etc). It is recommended to enable per package instead of globally
`gdbm`	Enable sys-libs/gdbm database backend for header caching
`gnutls`	Prefer net-libs/gnutls as SSL/TLS provider (ineffective with USE=-ssl)
`gpgme`	Build gpgme backend to support S/MIME, PGP/MIME and traditional/inline PGP
`gsasl`	Use GNU SASL via virtual/gsasl instead of Cyrus SASL (requires USE=sasl)
`hcache`	Enable header cache, one database backend needs to be enabled
`idn`	Enable support for Internationalized Domain Names
`imap`	Add support for IMAP (Internet Mail Application Protocol)
`kerberos`	Add kerberos support
`lmdb`	Enable dev-db/lmdb database backend for header caching
`mbox`	Add support for mbox (/var/spool/mail) style mail spools
`nls`	Add Native Language Support (using gettext - GNU locale utilities)
`pgp-classic`	Build classic_pgp backend to support PGP/MIME and traditional/inline PGP
`pop`	Enable support for POP3 mailboxes
`prefix`	Defines if a Gentoo Prefix offset installation is used
`qdbm`	Add support for the qdbm (Quick Database Manager) library
`sasl`	Add support for the Simple Authentication and Security Layer
`selinux`	!!internal use only!! Security Enhanced Linux support, this must be set by the selinux profile or breakage will occur
`slang`	Add support for the slang text display library (it's like ncurses, but different)
`smime-classic`	Build classic_smime backend to support S/MIME
`smtp`	Enable support for direct SMTP delivery
`ssl`	Add support for SSL/TLS connections (Secure Socket Layer / Transport Layer Security)
`tokyocabinet`	Enable dev-db/tokyocabinet database backend for header caching
`vanilla`	Do not add extra patches which change default behaviour; DO NOT USE THIS ON A GLOBAL SCALE as the severity of the meaning changes drastically

Data provided by the Gentoo Package Database · Last update: 2024-03-22 09:01 More information about USE flags

IMAP

The imap USE flag is probably the most important feature to enable for Mutt. Enabling it is only beneficial. Most email providers, even free ones such as Gmail, use IMAP, as it is the most convenient way to store email that is accessed from multiple clients at the same time and/or different locations. Because IMAP keeps all mail at the server, Mutt just downloads the messages that you want to view.

Header cache backends

Next to reading messages, it often happens that you will list a mailbox, to see what is in there. For this information, Mutt has to download the message headers. When you switch folders frequently, or your folders contain a large amount of emails, downloading the message headers over and over again will take some time. Since this simply is a waste, Mutt uses a so-called header cache (USE flag hcache) to keep the most important bits of messages that it needs to greatly speedup opening folders. This header cache is backed by a db-library, of which five flavours exist: berkdb, gdbm, lmdb, qdbm, and tokyocabinet. If you don't have any preference yourself, pick lmdb as it is the fastest when used with Mutt. You can only enable at most one db-library USE flag for hcache backend. If you re-emerge Mutt with a different db-library later, Mutt will rebuild its caches automatically when it opens a folder.

Sending mail

While IMAP is important for reading mail, sending mail requires a mail server. Mutt can deliver mail using a local (send)mail submission, but often that's not a good solution for users that travel around (e.g. laptop users). Mutt comes with SMTP support which is enabled by default with the smtp USE flag. Mutt's SMTP support allows you to send mail over a mail server of your choice with the option to authenticate an account. This is usually an SMTP server given to you by the email provider.

Secure protocols

Both IMAP and SMTP protocols send data over encrypted channels. With the imap and/or smtp USE flags enabled, it is wise to enable the ssl or gnutls USE flags. Both add the secure variants (imaps and smtps) to Mutt's list of supported protocols using either OpenSSL's or GNUTLS' implementation respectively. Most readers will not have a strong preference between OpenSSL and GNUTLS, so just go for ssl, since it is most likely this is already in the system's global list of USE flags. When intending to authenticate when sending e-mail, be sure to also include the sasl USE flag. The sasl USE flag is required for authentication when sending email.

Encryption

Even with secure IMAPS and SMTPS protocols, it is best practice to sign and/or encrypt email messages. Mutt supports traditional OpenPGP and S/MIME. Both of these are supported using the gpgme wrapper. The easiest way to setup support for signed and encrypted messages is using the gpgme USE flag. Documentation and experiences in this area can be confusing to say the least. When enabling gpgme USE flag, ensure the backend has been properly setup in the configuration (see below).

Configuration

After you emerge Mutt with some choice USE flags, the only necessary next step is to create a .muttrc file. muttrc's are to be found in many places on the web and in Mutt's documentation. In /usr/share/doc/mutt-<version>/samples some muttrc samples from the official distribution can be found. A very minimal .muttrc for an IMAP based account with SMTP mail delivery is shown below. It also enables signing emails via gpg using the gpgme backend.

Files

.muttrc

FILE ~/.muttrcA .muttrc example file

# character set on sent messages
set send_charset="utf-8"
# if there is no character set given on incoming messages, it is probably windows
set assumed_charset="iso-8859-1"
  
# make sure Vim knows Mutt is a mail client and that a UTF-8 encoded message will be composed
set editor="vim -c 'set syntax=mail ft=mail enc=utf-8'"
  
# just scroll one line instead of full page
set menu_scroll=yes
  
# we want to see some MIME types inline, see below this code listing for explanation
auto_view application/msword
auto_view application/pdf
  
# make default search pattern to search in To, Cc and Subject
set simple_search="~f %s | ~C %s | ~s %s"
  
# threading preferences, sort by threads
set sort=threads
set strict_threads=yes
  
# show spam score (from SpamAssassin only) when reading a message
spam "X-Spam-Score: ([0-9\\.]+).*" "SA: %1"
set pager_format = " %C - %[%H:%M] %.20v, %s%* %?H? [%H] ?"
  
# do not show all headers, just a few
ignore          *
unignore        From To Cc Bcc Date Subject
# and in this order
unhdr_order     *
hdr_order       From: To: Cc: Bcc: Date: Subject:
  
# brighten up stuff with colors, for more coloring examples see:
# http://aperiodic.net/phil/configs/mutt/colors
color normal      white          black
color hdrdefault  green          default
color quoted      green          default
color quoted1     yellow         default
color quoted2     red            default
color signature   cyan           default
color indicator   brightyellow   red
color error       brightred      default
color status      brightwhite    blue
color tree        brightmagenta  black
color tilde       blue           default
color attachment  brightyellow   default
color markers     brightred      default
color message     white          black
color search      brightwhite    magenta
color bold        brightyellow   default
# if you don't like the black progress bar at the bottom of the screen,
# comment out the following line
color progress    white          black
  
# personality settings
set realname = "Larry the cow"
set from = "larry@mail.server"
alternates "larry@mail.server|larry.the.cow@mail.server"
# this file must exist, and contains your signature, comment it out if
# you don't want a signature to be used
set signature = ~/.signature
  
# aliases (sort of address book)
source ~/.aliases
  
# IMAP connection settings
set mail_check=60
set imap_keepalive=300
  
# IMAP account settings
set folder=imaps://larry@imap.mail.server/
set spoolfile=imaps://larry@imap.mail.server/
set record=imaps://larry@imap.mail.server/Sent
set postponed=imaps://larry@imap.mail.server/Drafts
  
# use headercache for IMAP (make sure this is a directory for better performance!)
set header_cache=/var/tmp/.mutt
 
# uncomment this to enable the sidebar feature
#set sidebar_visible = yes
set sidebar_width = 15
set sidebar_folder_indent = yes
set sidebar_short_path = yes
 
# make the progress updates not that expensive, this will update the bar every 300ms
set read_inc = 1
set time_inc = 300
 
# only if you compiled Mutt with USE=gpgme, enable the gpgme backend
set crypt_use_gpgme = yes
# you can set this to hide gpg's verification output and only rely on Mutt's status flag
#set crypt_display_signature = no
# enable signing of emails by default
set pgp_autosign = yes
set pgp_sign_as = 0xXXXXXXXX   # your gpg keyid here
set pgp_replyencrypt = yes
 
# mailboxes we want to monitor for new mail
mailboxes "="
mailboxes "=Lists"
  
# mailing lists for a Gentoo user (these are regexps!)
subscribe "gentoo-.*@gentoo\\.org"
  
# SMTP mailing configuration (for sending mail)
set smtp_url=smtp://larry@mail.server/

Note
It is a good practice to review all of the settings from the example configuration file above. There are many more configuration options, and some preferences may not be to your liking. Keep this in mind if Mutt doesn't function exactly the way you like when you are first setting it up.

The example .muttrc above sets up an IMAP account, uses an SMTP server to send mail, stores its cache in /var/tmp/.mutt, reads the known address aliases (think of it as an address book) from ~/.aliases and appends the signature from ~/.signature when composing new mail. For some IMAP servers it may be necessary to change the spool, record and postponed directories, as the folders Sent and Drafts may be under a folder called INBOX. Simply trying this out with Mutt is the simplest way to figure this out.

Once the .muttrc is setup, you are ready to launch Mutt by just running mutt. If you entered a valid IMAP server URL, Mutt will prompt for a password and afterwards load all messages. Note that the first time entering your mailbox may take a while if you have quite some messages, since Mutt's header cache is still empty. If this succeeds you're in your IMAP mailbox ready to go.

Navigation is intuitive, as is reading messages by just pressing the Enter key or Space bar. Mutt is quite Vim alike in that it uses key strokes to perform most of its actions. You best read Mutt's manual to become familiar with all existing functions (or press ? in Mutt) and what key they are bound to, or better, what key you like it to be bound to. Some essential keys are m (for message) to start composing a new message, q for quit, r for reply, s for save and p for print.

.mailcap

One of the features that Mutt has that is still not in today's most savvy email clients is the ability to display attachments inline through some viewer. The auto_view directive in the .muttrc file tells Mutt which attachments (based on their MIME-type) it should view inline. To figure out how to do that, Mutt uses mailcap files to lookup how to display a certain MIME-type. Usually the system wide mailcap file isn't sufficient here, so you better start a ~/.mailcap file to put items in there for copiousoutput that Mutt can display inline.

In the example .muttrc above auto_view is enabled for application/msword and application/pdf files. These two show the extreme usefulness of this capability, because it means meeting notes sent as doc file now are perfectly fine readable without having to save the attachment and open it in LibreOffice. Instead the text just shows up in the message reader, that is, if you have a matching entry in your ~/.mailcap file.

FILE ~/.mailcapExample .mailcap file

application/msword; antiword '%s'; copiousoutput; description=Word Document;
nametemplate=%s.doc
application/pdf; pdftotext '%s' -; copiousoutput; description=PDF Document;
nametemplate=%s.pdf

The above .mailcap example tells Mutt what to do to "view" msword and pdf files. For the former it should run a program called antiword, for the latter the program pdftotext (emerge app-text/poppler). You can go wild with these to for example display rendered HTML (give app-text/vilistextum a try), render vcards, or show ASCII representation of attached images. All you need to do is define how to call the program in your .mailcap, and tell Mutt to try to view it inline using the auto_view directive.

Configuration Scripts

Mutt Wizard

Initial setup of Neomutt can be intimidating to those who have not done it before. To make the process easier, mail-client/mutt-wizard was created. As the name suggests, it walks the user step-by-step through the process of setting up a proper muttrc file.

Conclusions

Mutt is a very versatile console email client. If you like the concept, Mutt can be altered to behave in nearly any way through its configuration. Search the web to find others explaining how they did "it", or find one of the many patches that exist to make Mutt do even more. Gentoo applies a couple of very popular patches to Mutt, so make sure to check mutt -v if you want something more to make sure it is not yet already at your disposal. While learning Mutt is not necessarily easy, once it is in your fingers, it can make your mail experience much faster and efficient than with other clients. Searching for example is quite powerful if you know how to hit the right flags and know which regular expression narrows your search down. Enjoy Mutting!