Test Your Rules Before They Touch Real Mail

A rule that looks correct in the editor can still behave differently once mail starts flowing through it. Maybe the condition is narrower than you assumed, maybe another rule in the same group gets there first. Discovering that from a user complaint is the expensive way to find out.

MSH Postfix Milter’s Rules Tester panel exists for exactly this. You compose a test message, sender, recipients in To, Cc and Bcc, subject and body, then click Send to run it through the rules engine without sending any real email. The results show which rules matched, which conditions were evaluated and what actions would be applied.

Checking the awkward cases

The Attachments tab lets you attach real files to the test message, which is what you want when a rule blocks by type, compresses oversized files or strips them to a folder. Testing those against an actual file beats reasoning about content types in your head.

There is also a Sent date field that sets the date and time the message is considered to be sent. If a rule is scheduled to run only outside office hours, you can confirm it fires on a Saturday afternoon without waiting until Saturday afternoon, and confirm it stays quiet on a Tuesday morning.

To learn more visit MSH Postfix Milter website.