I’m having issues on my Exchange 2003 server that I think are happening because it’s not returning an SMTP Banner. I perform a local telnet and the SMTP banner displays correctly, but when any outside connection is attempted, it says an "SMTP Banner was not returned within 30 seconds".
I found this out when I attempted to put a external spam filter in place for my company. The testing software in the spam filter needs the Exchange server to return an SMTP Banner within 30 seconds or it will not deliver mail. Each time I run a test is returns “SMTP Banner not returned within 30 seconds”. Any thoughts?
Note: firewall is set to allow all inbound port 25 traffic