Many Linux software depends on the
sendmail program to send mail.
We have good experience with the sSMTP application. It provides a sendmail
implementation which sends the mail directly to an SMTP server.
To install sSMTP on Ubuntu:
sudo apt-get install ssmtp
Edit its main configuration file:
Set sSMTP to send mail to the Message Submission port of Mireka. For example:
You may also want to set other properties and edit the other configuration file,
If sSMTP is on a different host than Mireka, then set Mireka to allow message submission from the sSMTP host. See Authenticate by IP address.