Rewrite subject lines automatically

Sometimes the content of a message is fine and only the subject line needs to change. MSH Postfix Milter’s rewrite subject action lets you match part of a subject with a regular expression and replace it with whatever text you need, as messages pass through the milter.

A few practical uses

Combined with a message direction condition, you can prefix every incoming message from outside your organization with [EXTERNAL], giving employees an immediate visual warning before they trust a message that looks like it came from a colleague. The same action can also strip unwanted tags a previous filter left behind, or standardize subjects on messages generated by an external system so they stay consistent with everything else in the inbox.

Because the match is a full regular expression, you are not limited to a fixed prefix or suffix, you can rewrite whatever part of the subject the pattern captures.

To learn more visit MSH Postfix Milter website.