Alejandro Facultad:
> Dear, I have Debian Squeeze + Postfix 2.7 as my mail server.
> Sometimes some users tell me they send a message and the recipient
> get 2 or 3 copies of the same message. At the moment they can't
> explain me what they have done in detail, so I need your opinion
> to have any idea of the cause of this behaviour.
The answer is in your mail server logfile: the client submits the
same message multiple times; the recipient is on an alias that is
expanded multiple times; or Postfix delivers the message multiple
times, perhaps because the remote SMTP server is too slow.
If the above is in not your logs, then message duplication can happen
after Postfix has delivered the message.
Wietse
