Duplicate suppression and message-id reuse
thomas.jarosch at intra2net.com
Thu Apr 14 11:45:11 EDT 2011
I recently had to disable duplicate suppression on our mailservers
as a broken mail client (=some Outlook versions) reuses the message-id
if you forward a message.
Long story short, the users are now complaining about duplicated
emails instead of never received messages...
Here's my proposal to make duplicate suppression more robust:
Combine the "message-id" header field with the "date" header field
for the duplicate check. If a broken client reuses the message-id,
there's a good chance the date field changed.
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