|MSH Autoresponder for Postfix and Sendmail|
I will skip the part with the program installation and configuration and just go to the essential part of creating rules. You can find documentation about installation here.
When an app is ready and running create a rule. Select Autoresponder rules node, click button Add New button. For this blog post we will create a sample out of office auto reply. Fill Subject like "Out of Office: $SUBJECT". Users which will send emails to our mail server will receive auto replies with subject: Out of Office: