I wonder if anyone can help? I've done a lot of googling but still can't see anything that relates clearly to my problem.
When sending a newsletter to clients using Postfix as my MTA, I will get multiple deliveries of the same email to a user, although they are only listed once. I have isolated this as an MTA problem with Postfix and it occurs most often when sending to Yahoo email accts. In logs I get the message that Postfix lost connection with <name of server> while sending end of data -- message may be sent more than once. If this is an issue with the other corresponding server, or nothing that I can change in Postfix, then I'd rather the email not be sent at all than be sent multiple times. I'm running Postfix v2.5.1 Can anyone suggest what might be wrong?.... thanks.
