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headers check for mailing list and autoreply

Autoresponder and mailing lists

I am subscribed to much mailing lists, and espacially on holidays, I notice many people set their autoresponders to reply to the mailing list.
It's annoying and whenever possible should be avoided, by checking several headers befor autoreplying.

Headers to check and patterns

Mailing lists have pretty verbose footprints. Unfortunately, There is no standard I know about that, but there is a simple enumeration of what headers and patterns a mailing list has.

Return-Path: and Sender:

Return-Path: and Sender: match owner\-\.+@, ^\.+\-request@, and ^\.+\--bounces@

List-ID: or X-Mailing-List:

If there is a List-ID: or X-Mailing-List: header, it's probably from a mailing list!

To: or Cc:

If you receive an email, but you're not in the To: or Cc:, then you probably should avoid autoreplying.

"Precedence: Bulk" or "Precedence: List"

A little documentation about the "Precedence:" header where we see that "bulk" value mean the message is a "one-to-many" (typical for mailing lists)

Conclusion

We then have a set of criteria to check, have a good time... :-)

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