I also set tcp_windowsize = 65535 but this had no effect on the ability to send the emails.
Rob A wrote > Wietse, > > Thanks for your response. > > I can consistently send a 1 MB attachment to a recipient with no issues, > but consistently get "421 4.4.2 service timed out. (in reply to end of > DATA command)" with a 3 MB attachment sent to the same recipient. > > I have turned off tcp_window_scaling on my postfix server: * > # cat /proc/sys/net/ipv4/tcp_window_scaling > 0 * > > And tcpdump indicates no scaling is used as well: * > [Window size scaling factor: -2 (no window scaling used)] * > > Is there something else I should be looking at to resolve the issue? > > - Rob A -- View this message in context: http://postfix.1071664.n5.nabble.com/421-4-4-2-service-timed-out-tp87189p87207.html Sent from the Postfix Users mailing list archive at Nabble.com.
