As an example of how to set up your MTA, in postfix on Ubuntu, you might
add the following to its configuration.

In /etc/postfix/master.cf:

  alaveteli unix  -	n	n	-	50	pipe
    flags=R user=ALAVETELI_USER argv=ALAVETELI_HOME/script/mailin

In /etc/postfix/main.cf

  virtual_alias_maps = regexp:/etc/postfix/regexp

For example

ALAVETELI_HOME=/path/to/alaveteli/software
ALAVETELI_USER=www-data

The user ALAVETELI_USER should have write permissions on ALAVETELI_HOME.

And, assuming you set `OPTION_INCOMING_EMAIL_PREFIX` in your config at
`config/general` to "foi+", create `/etc/postfix/regexp` with the following
content:

  /^foi.*/	alaveteli


You should also configure postfix to discard any messages sent to the `BLACKHOLE_PREFIX`
address, whose default value is 'do-not-reply-to-this-address'. For example, add the
following to /etc/aliases:

    # We use this for envelope from for some messages where we don't care about delivery
    do-not-reply-to-this-address:        :blackhole:

# Logging

For the postfix logs to be read by the script 'load-mail-server-logs' succesfully they need to be log rotated with a date in the filename. Since that will create a lot of rotated log files (one for each day), it's good to have them in their own directory. For example (on Ubuntu) /etc/rsyslog.d/50-default.conf

  mail.*                          -/var/log/mail/mail.log

And also edit /etc/logrotate.d/rsyslog:

  /var/log/mail/mail.log
  {
          rotate 30
          daily
          dateext
          missingok
          notifempty
          compress
          delaycompress
          sharedscripts
          postrotate
                  reload rsyslog >/dev/null 2>&1 || true
          endscript
  }

You'll also need to tell Alaveteli where the log files are stored and that they're in postfix format. Update config/general.yml with:

  MTA_LOG_PATH: '/var/log/mail/mail.log-*'
  MTA_LOG_TYPE: "postfix"

# Troubleshooting

To test mail delivery, run:
  
  $ /usr/sbin/sendmail -bv foi+requrest-1234@localhost

This tells you if sending the emails to 'foi\+.*localhost' is working.