[Mailman-Users] Multiple messages

Richard Barrett R.Barrett at ftel.co.uk
Wed Jan 29 16:31:30 CET 2003

At 14:12 29/01/2003, Tom wrote:
>Simon White wrote:
> >29-Jan-03 at 12:26, Tom (mm at simpletcpip.com) wrote :
> >
> >
> >>Hi All,
> >>
> >>I've had a quick search thru the list archives and can't find any
> >>problems that exactly match mine.
> >>
> >>Basically, any emails from a company 'N' to one of our lists cause
> >>duplicate messages.  It always seems to be 11 copies for some reason.
> >>All the message ids are the same, only one message appears in the
> >>archives, and the other members at 'N' only receive one copy.
> >>
> >>I'm using sendmail 8.11.6 and Mailman 2.0.11, but this problem has been
> >>ocurring since 'N' was given a list they could send to, and that was
> >>quite a few versions ago.
> >>
> >>There isn't anything particularly odd about the messages (they are also
> >>CCd directly to myself so I know it isn't chopping anything off)
> >>
> >>Any ideas on how I can troubleshoot this?
> >>
> >>
> >
> >What happens in the sendmail logs when the mail is injected? e.g. is it
> >sendmail that is creating dupes or mailman?
> >
> >
>I may have been misleading - I'm not sure that sendmail has anything to
>do with it really.  The mail gets to sendmail on the list server, there
>are two entries there, one saying from xxx at N and one showing it being
>piped to mailman/mail/wrapper post list
>A few seconds later this shows up in the mailman smtp log
>Jan 29 10:13:01 2003 (4859) smtp for 112 recips, completed in 0.315 seconds
>After that point I have no knowledge as mailman is using an SMTPHOST (at
>our internet provider) which I believe is exim but I don't know the version.

Just a suggestion but I'd be inclined to have Mailman handoff outgoing mail 
to your local sendmail instance using SMTP, with your local sendmail 
instance set up to relay mail outgoing mail from your domain to your ISP's 

This has a couple of advantages. You can see the handoff to the external 
MTA in your sendmail logs and be much clearer about where problems are 
likely to be occurring. You've also got better "evidence" of what is 
happening if you need to discuss a problem with your ISP's support staff.

It also means that your local sendmail instance can look after the handoff 
from inside to outside your domain; sendmail is better suited to this task 
(IMHO) than Mailman. Certainly, I've found Mailman can be a bit too 
aggressive in retrying the handoff to a non-local MTA if that MTA is having 
any difficulties in accepting mail. This might, or might not, be the cause 
of these duplications occurring.

>Once the mail comes back to our main mail server (Groupwise), the logs
>show one incoming message from the list admin to each local member of
>the list, which I guess is what you would expect.
> >Are you on the list, and do you receive the 11 copies? Or is it really a
> >screwed MTA somewhere else that is perhaps being strange?
> >
> >
> >
>I'm on the list and I get 11 copies (not including the one CCd directly
>to me).  The strange thing is that messages sent directly from people at
>"N" work fine.  Messages sent to the list from anyone else work fine.
>  And after a bit of digging it seems that not all the recipients do get
>11 copies, although I haven't been able to find a correlation between
>those that do and those that don't - though it does seem to be a per
>site rather than per person basis.
>Hope that makes sense,
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