Mon Aug 15, 2011 5:46 pm
Find a freeware email program that can send an email and use it to send mail from various machines to determine if the mail server is rejecting mail. If the server is not rejecting mail install wireshark on your dude server and verify that traffic is actually going to the mail server when it should by causing a false positive. In wireshark put "host 192.168.1.1" to filter traffic to only the server you are interested in where the IP address matches that of your mail server.
GL,
Lebowski