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msmtp is a very simple and easy to use smtp client with excellent sendmail compatibility.

An alternative lightweight MTA that also handles local mail is dmaAUR, available in the AUR.


msmtp is in the extra repository.

# pacman -S msmtp

Quick start

The following is an example of a msmtp configuration file for several accounts. If msmtp throws errors when using this file, search for double byte '\xc2\xa0' characters that may have been erroneously inserted.

# Accounts will inherit settings from this section
auth             on
tls              on
tls_trust_file   /usr/share/ca-certificates/mozilla/Thawte_Premium_Server_CA.crt

# A first gmail address
account        gmail
port           587
password       password

# A second gmail address
account    gmail2 : gmail
password   password2
# It looks like Google's in the process of becoming its own certificate
# authority. For some users, they seem to have switched to a "Google
# Certificate Authority" certificate, which is rooted in Equifax.
#tls_trust_file /usr/share/ca-certificates/mozilla/Equifax_Secure_CA.crt

# A freemail service
account    freemail
host       smtp.freemail.example
from       joe_smith@freemail.example
user       joe.smith
password   secret

# A provider's service
account   provider
host      smtp.provider.example

# Set a default account
account default : gmail

msmtp will refuse to start if user configuration file is readable and writeable to anyone else but the owner:

$ chmod 600 ~/.msmtprc

This does not apply to system configuration file (in Arch, this is /etc/msmtprc; copy the example over from /usr/share/doc/msmtp/ ).

If your application uses "mail" (mailx) to send mail (e.g. smartd), specify msmtp:

set sendmail=/usr/bin/msmtp

Test msmtp

The -a flag specifies the account to use as sender; <username> is the recipient.

Save (with the addresses you want to use)

To: <username>
Subject: A test

Yadda, yadda, yadda.

as, say, "test.mail".

Then execute

$ cat test.mail | msmtp -a default <username>

Do not merely use "echo 'Yadda, yadda, yadda.'" instead of "cat test.mail". This causes at least Gmail and Yahoo to deliver the mail incorrectly.


Practical password management

The password directive may be omitted. In that case, if the account in question has auth set to a legitimate value other than off, invoking msmtp from an interactive shell will ask for the password before sending mail. msmtp will not prompt if it has been called by another type of application, such as Mutt.

If this is not desired, an alternative is to place passwords in ~/.netrc, a file that can act as a common pool for msmtp, OfflineIMAP, and associated tools.

Using msmtp offline

Note: The msmtp source distribution includes msmtpq and msmtpQ in the ./scripts directory, which are updated versions of the msmtpqueue bundle.

Although msmtp is great, it requires that you be online to use it. This isn't ideal for people on laptops with intermittent connections to the Internet or dialup users. Several scripts have been written to remedy this fact, collectively called msmtpqueue.

The scripts can be downloaded from SourceForge, the most recent of which is msmtpqueue-0.5.tar.gz.

Once the scripts have been downloaded extract them using:

$ tar xf msmtpqueue-0.5.tar.gz

After that, copy the scripts to a convenient location on your computer (/usr/local/bin is a good choice):

$ cp msmtpqueue-0.5/*.sh /usr/local/bin/

Finally, change your MUA to use instead of msmtp when sending e-mail. Queued messages will be stored in ~/.msmtpqueue.

When you want to send any mail that you've created and queued up run:

$ /usr/local/bin/

Adding /usr/local/bin to your PATH can save you some keystrokes if you're doing it manually. The README file that comes with the scripts has some handy information, reading it is recommended.

Vim syntax highlighting

The msmtp source distribution includes a msmtprc highlighting script for Vim. Install it from ./scripts/vim/msmtp.vim.

Send mail with PHP using msmtp

Look for sendmail_path option in your php.ini and edit like this:

sendmail_path = "/usr/bin/msmtp -C /path/to/your/config -t"

Note that you can not use a user configuration file (ie: one under ~/) if you plan on using msmtp as a sendmail replacement with php or something similar. In that case just create /etc/msmtprc, and remove your user configuration (or not if you plan on using it for something else). Also make sure it's readable by whatever you're using it with (php, django, etc...)

From the msmtp manual: Accounts defined in the user configuration file override accounts from the system configuration file. The user configuration file must have no more permissions than user read/write

So it's impossible to have a conf file under ~/ and have it still be readable by the php user.

To test it place this file in your php enabled server or using php-cli.

mail("", "Test email from PHP", "msmtp as sendmail for PHP");


Issues with TLS

If you see the following message:

 msmtp: TLS certificate verification failed: the certificate hasn't got a known issuer

it probably means your tls_trust_file is not right.

Just follow the fine manual. It explains you how to find out the server certificate issuer of a given smtp server. Then you can explore the /usr/share/ca-certificates/ directory to find out if by any chance, the certificate you need is there. If not, you will have to get the certificate on your own.

If you are trying to send mail through GMail and are receiving this error, have a look at this thread or just use the second GMail example above.

If you are completely desperate, but are 100% sure you are communicating with the right server, you can always temporarily disable the cert check:

$ msmtp --tls-certcheck off