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-tp87189p87206.html Sent from the Postfix Users mailing list archive at Nabble.com.
