We run a Windows server 2003 shop with exchange 2003.
Recently we began receiving delay notifications from our exchange server, after investigating some of these domain names I noticed that I could not telnet into the mail server. 98% of email works just fine, but on a few select domains... I can't telnet to the mail server? The telnet session appears to connect, but just sits there with a blank sreen.
We received the following NDR from our exchange box...
Your message did not reach some or all of the intended recipients.
Subject: RE: new e mail account
Sent: 2/12/2009 8:41 AM
The following recipient(s) cannot be reached:
'Jasper Darson ' on 2/14/2009 7:57 AM
Could not deliver the message in the time limit specified. Please retry or contact your administrator.
After doing a MX nslookup for the associated domain name (set q=mx).
I get a mail server of mail.darson.com.tw. When I attempt to connect via telnet the session just goes blank and hangs?
I can connect to this mail server from home, we just can't do it from work? Could our IP be blocked on th recipient end?