On Friday 22 April 2016 20:20:50 Brian wrote: > It's a waste of time. Even if you conclusively demonstrated the offending > header was Message-Id: (and it almost certainly is a major player) what > would you do? Better is to avoid providers who think it fine to mess with > your mail. People wouldn't accept Royal Mail or the US Postal Service > doing it.
I have a particular instance, where it would be useful if I knew what to avoid in order to be allowed some "duplicates". I am now careful to ensure that they are not identical, but they are still sometimes treated as duplicates. If I were able to analyse why, I could avoid the deletions every time. > > As for duplicates: are the mails sent to the list and the one sent back > duplicates? That is, identical in every regard? No. It is a different situation involving "duplicates" and Gmail. Lisi
