SMTP Madness

Have you already tried to restart the mail services?

I sure did. Was x-ing my fingers hoping that would resolve it but no such luck. Very strange deal as it has been working fine for the last 5 years or so with no problem and "out of the blue" last week, Presto, not accepting or sending email related to comcast.net and won't let offsite folks log RDP if they are on a comcast IP. Never seen anything like it in my 10 years of IT service... Crazy...

Sounds like a ban on the comcast ip range referred to as blacklisted. Check your firewalls. Talk to your isp.

Thanks. Check that. Not on any blacklists and no known issues, firewalls ok. :sigh:

can you do a nslookup from the server to comcast.net or comcast.com?

Wow, nice call. I somehow overlooked that.... and the system sez.... sbs-server-.xxxxx.local (xx sub my name) "can't find nslookup: non-existent domain" I get the same result when I check by xxxxx.tv and if I check by ip 192.168.x.x it times out timeout is 2 seconds. I get the same timeout result if I do the lookup for comcast.net or com or any other (i.e aol.com) What the heck? and I can still send and recieve email from every place known to man EXCEPT comcast.net addresses? Crazy! Geez, what now leuitenent? I'm at a loss. either that or, I'been been on it too long and my brain is fried.... Thanks so much for your help wanderer...