| The FORGED_MUA_* rules mainly compare the X-Mailer header with the
| format of the Message-ID header.  From the mail header below, it seems
| that Outlook is not generating a Message-ID  at all, relying on the
| next step to insert one (this behaviour is permitted by the
| standards).  This suggests that this version of Outlook should be
| excluded from the FORGED_MUA_OUTLOOK check.

We had false +ve FORGED_MUA_OUTLOOK recently.  Clearly the Message-ID was
not written by outlook!  Maybe outlook didn't generate one.

OR, I think there are sites where the gateway MTA strips the
client-generated Message-ID and replaces it with a "corporate" standard
one.

Plausible ?

Example headers below - apologies the msg had been thru about 3 scanners
before I got it so I've had to strip some irrelevant stuff.

Chris

--
Chris Edwards, Glasgow University Computing Service




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