On 02/11/2013 11:36 PM, Wietse Venema wrote:
Rolf E. Sonneveld:
In general, Postfix is running fine and this Postfix instance is also
running fine. However, there is one SMTP client (of which we are not in
control), that sends messages with long lines to this server running
Postfix. There is a problem with the communication between this client
and the server: whenever the clients sends a message which includes one
long line (377 characters, excluding the CRLF), the client seems to
'hang' after character # 256 of this long line is transmitted. Then,
after some time the connection times out.
A tcpdump recording will reveal if the client stops sending or if
the server stops reading (it's revealed by TCP receive window size).
Once this is known the search can be focused. It could be somethinh
as stupid as poorly-implemented anti-virus software.
http://www.postfix.org/DEBUG_README.html#sniffer
thanks for your answer. I did a tcpdump for the session but when
analysing it, I could not find a clear cause. At the end of the day, it
appeared to have been a cli/tty related limitation (of Solaris?). See
for a discussion
https://forums.oracle.com/forums/thread.jspa?messageID=8292168). When
sending the same data using a perl script it worked without a problem.
/rolf
