[SM-USERS] Re: ost connection with (server) while sending end of data -- message may be sent more than once

[<wi...@po...>]

Jimmy Bergetun:
> > Jimmy Bergetun:
> >> > Jimmy Bergetun:
> >> >> <error>
> >> >>     lost connection with mx.its.monash.edu.au[130.194.11.147] while sending
> >> >>     end of data --
> >> >>     message may be sent more than once
> >> >> </error>
> >> >
> >> > With SMTP, the receiving host replies when the message is received.
> >> > The TCP connection was broken before Postfix received that reply,
> >> > and therefore it is required to send the message again.
> >> >
> >> > When this problem persists, I wonder if this is caused by some
> >> > broken ``firewall'' that expires its connection table too soon.
> >> >
> >> > 	Wietse
> >> >
> >>
> >>
> >> Thank you very much for the replay.
> >> I have not changed anything at my end of the firewall and monash is the only server I
> >> am
> >> having problems with. ( Monash is a big server 10 thousands maybe hundreds thousand
> >> email each day)
> >
> > Arre you on the Monash campus? If not, there is an unknown amount
> > of opportunity for screw-ups between the two.
> >
> > 	Wietse
> >
> 
> 
> Sorry, I am getting very desperate here.
> There seems not only to be problemns sending e-mails to the Monash network but also to
> mx.zoneedit.com.  The only thing I have changed on my part of the network is the ISP
> (DSL)  so maybe there is a problem there (?).  I have tried everything on my network but
> I am not an expert so I dont know what I can do for testing.

This is not an application problem. The answer is not in Postfix
logging.

This is a network problem. The answer is in a COMPLETE tcpdump
recording.  I suggest that you follow the instructions in the
Postfix DEBUG_README file,

I will NOT look at the line wrapped and truncated tcpdump output
that was included in your message.

	Wietse