On Tue, 2 Apr 2002, Clifton Royston wrote: > If the hash is reasonably robust, like an MD5, there should be a > vanishingly small chance of this. There also should never be two > messages with the same message ID, unless there is a problem in the > mail system where they originated; perhaps concatenating a hash of the > total headers and a hash of the message ID alone would reduce the odds > further?
It would need to be a problem on the sender MUA and the relay machines as Received: headers count towards the hash too. I _have_ seen MS-based systems stamp the same identical message-ID on all outbound messages over a several month period. It seemed to be some dort of MAPI bug, but as qpopper's UIDL doesn't rely on message-ID, that won't matter (and Messag-ID is OPTIONAL in mail systems anyway). AB
