I've ran the tcpdump and imported it into wireshark but I'm not exactly sure what I'm looking at. Attached is the dump. Thank you for any insight!
https://dl.dropboxusercontent.com/u/3432879/postfixdump.zip On Thu, Sep 22, 2016 at 3:05 PM Joseph Thibeault <j...@dashride.com> wrote: > Thank you. I've ran the tcpdump and imported it into wireshark but I'm not > exactly sure what I'm looking at. Attached is the dump. Thank you for any > insight! > > > On Thu, Sep 22, 2016 at 6:38 AM Wietse Venema <wie...@porcupine.org> > wrote: > >> Joseph Thibeault: >> > We use postfix as a mail queue / sending service in one of our >> > applications. This application generates emails with PDF attachments. >> Some >> > of the emails with PDFs get sent fine, but others seem to cause a >> "timeout >> > after DATA" error. >> > >> > Through reading online, I've seen answers such as adjusting the MTU >> size on >> > the network interface, etc. None of these solutions have worked. Has >> anyone >> > had this happen, do you have any suggestions to fix it? >> >> To diagnose the problem, make a packet recording, and have it >> reviewed by an expert who can use that to determine if the problem >> is with the sender, receiver, or in-between. That's more effective >> than making random black-box changes. >> >> http://www.postfix.org/DEBUG_README.html >> >> Wietse >> >
