Unfortunately, I did the test some weeks ago, and the logs have been rotated away...
I don't think I'd like to bother 3500 users again with my mass emails...
If you have a solution to test this, without real email...

Finally, I'm not so sure about the email being resent because of unreachable recipients.
One thing I remember:
In the postfix spool, in the defered dir, there were LOT of emails with different hash names.
Looking in some of them, I noticed recipients duplicated in several of them, this should not be normal...
In the logs, I could see some these hashed defered emails being repeated several times, each time with a cause why the mail was being defered.

There surely is something wrong in my setup. However I have thousands of mails per day being sent (one by one...) correctly from the same forum.

Regards


Ralph Angenendt a écrit : 
sophana wrote:
  
                                I think the problem was that when one of
the recipients was unreachable, the mail went into defered state, to be
retried later. The problem (bug?) is that the mail was sent again to all
50 recipients, explaining why so many users received lot of mails.
    

That looks like a problem on the *recipient* site. Normal processing of
the mail should go ahead for all *reachable* adresses during the smtp
dialogue, so the mail only gets deferred for the non-reachable
recipients. On the other hand: If the recipient decides to *not* take
the mail at all because one of the recipients is unreachable (or the
limit of errors during the smtp handshake has been reached), you should
never be able to reach the DATA phase in the smtp dialogue - so no mail
gets sent at all.

If some mail gets sent, postfix *never* resends mails to those
recipients who already got the mails.

But without seeing any logs everything's just a cloudy image in my
crystal ball. It might also be that your setup is broken.

Ralph
  

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