Recently, I recv'd some complaints from various user of mine that some of there senders cannot send an e-mail to our site. What is confusing, is that I would say that 5% of senders can't. Went to www.dnsstuff.com
and checked my e-mail and got the result below:
mail1.XXXX.com. - 64.xxx.xx.xx [Could not connect: Could not receive data: Operation timed out.]
[Note that if your mailserver takes over 30 seconds to respond, our test will timeout, even though real mailservers will wait longer]
Ran ethereal on my desktop and ran telnet on my e-mail box and discoverred that it does take 40.189 sec for SMTP to begin. Time was after the handshake frame to when SMTP kicked in. Checked another e-mail server and it was way slower. I am running sendmail with the latest patch from RedHat. Does anybody have any clue as to what is going on?
As always, thank you! In advance for your time on this matter.