Martijn de Munnik: > Hi list, > > I have a problem with delivering mail to a host and get this error: > > host mx2.amsterdam.nl[145.222.14.10] said: 421 enepmx02.amsterdam.nl > Error: timeout exceeded (in reply to end of DATA command) > > This error only seems to occur with 'large' mails. Currently I have a mail > of ~600KB and ~8MB stuck in the queue. I don't think this is a postfix > issue on our site but an issue with the mailserver on the other site. What > can cause such issues?
Record a tcpdump trace. The way the session fails will indicate the kind of problem (MTU, Window scaling, and so on). http://www.postfix.org/DEBUG_README.html Wietse
