SBS 2003 Port 25 Outbound Blocked
Posted on 2011-02-10
I have an SBS 2003 server that has suddenly stopped sending email.
Outbound messages are hung in the queue. Inbound email is fine.
I cannot telnet to port 25 on other public smtp servers from SBS, but I can telnet to port 25
from other machines / servers within the network to other external servers. AV has been temporarily removed from
the server. I've used netstat to look for other software that may be blocking the port, but