On 1/8/14, 10:03 AM, Doug Hutson wrote:
All the people that have e-mailed us about this issue were specifically yahoo addresses. Reports of 4-50 duplicates per user were sent to them. We only have one list of users we send users to, and this is the first time this has ever happened.
The few times that I ran in to this type of problem in the past were not Mailman issues at all. Rather they were symptoms of underlying SMTP issues. My clue when I fought this battle before was that the messages IDs down stream of my server(s) were different in each ""copy of the message. When investigating in my SMTP logs, I found that the delivery attempts were failing in some manner and my SMTP server was considering the delivery a failure and would retry until it saw the expected response. However, the receiving server did considered the delivery to be successful, and as such treated the message(s) as valid. Ultimately, causing duplicated messages.
When investigating the SMTP issue, I found that the problem was related to network connectivity issues, specifically saturated connection on the receiving end. - Once I addressed (worked around) the connectivity issues, the duplicate messages cleared up immediately.
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