[Mailman-Users] Duplicate Subscribe/Unsubscribe Notifications

[Ki Song]

>> Every subscription/unsubscription notification is sent twice to the admin's
>> email address.
>> How can I make sure only 1 notification is sent?
> ---------------- End original message. ---------------------
> 
> Are you certain of that?
> 
> It could be that the admin has a filter rule in place that duplicates
> the mail and makes it look like it is sent twice.
> 
> If it is indeed being sent twice, I would expect the messages to have
> different message IDs, the time sent may or may not be different. If
> the message IDs are the same on both copies, I would strongly suspect
> you are getting bit by a filter rule and Mailman is doing the right thing.
> 
> Dragon
> 
I am certain it is the EXACT same message.
How do I know this?
The message ID's for the duplicate emails are exactly the same:

Message-ID: <mailman.2147.1169820047.30843.list at mailserver.domain.com>


Could this be a postfix issue? I don't think so ... because my other,
regular messages, are being sent without duplicates.