I have a qmail server on Freebsd that is sending periodic duplicate emails. I dug around and found out that when connecting to the server through a telnet session everything goes good until i send the DATA command, type a message and enter the "." it takes like 5 minutes to get the 250 ok message, Im thinking this is the reason for duplicates, anyone got any ideas as to why its taking so long to process and accept the message? Its under normal load and the queue is normal as well.
whoa! thx for all the responses, but I solved it myself. It was a problem with a Spam Assasin module just in case that helps someone.