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How do I set up fail2ban to send emails using msmtp?

I tried changing the mta = sendmail line to mta = msmtp and the action = %(action_)s line to action = %(action_mwl)s.

I think /etc/fail2ban/action.d/msmtp-whois-lines.conf file, but I'm not sure what to put in it.

I can normally send mail from the command line with echo -e "Subject: subject\nMessage contents" | msmtp recipient@hotmail.com without a password.

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What I would do is the following:

First thing is to copy all action.d/sendmail-*.conf files to action.d/msmtp-*.conf files:

 for FILE in /etc/fail2ban/action.d/sendmail*.conf; do cp "$FILE" "${FILE/sendmail/msmtp}"; done

Next step is to change the occurrences of before = sendmail to before = msmtp in the action.d/msmtp-*.conf files:

sed -i 's/before = sendmail/before = msmtp/' /etc/fail2ban/action.d/msmtp-*.conf

This will correct the references to other sendmail configuration files like before = sendmail-common.conf.

Followed by changing all occurrences of sendmail -f <sender> to msmtp in `action.d/msmtp-*.conf:

sed -i 's/sendmail -f <sender>/msmtp/p' /etc/fail2ban/action.d/msmtp-*.conf.

This will correct the lines where sendmail is called like Fail2Ban" | /usr/sbin/sendmail -f <sender> <dest>

Final step is changing the mta = msmtp in the action.d/jail.conf file and reload fail2ban to test if these modifications work.

Another thing to keep in mind is the user context of fail2ban with respect to the msmtp configuration. If you have a local msmtprc file configured, it might not be applied when fail2ban tries to run msmtp due to other user context. In that case, configure msmtp with a global configuration or create a separate configuration for the user that runs fail2ban.

  • I also had to run something like sudo sed -i 's/\/usr\/sbin\/msmtp/\/usr\/bin\/msmtp/' /etc/fail2ban/action.d/msmtp*.conf, and there was also an msmtp.conf file which I changed – texasflood Oct 5 '15 at 8:56

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