scott@zaphod:~$ telnet a.mx.onesquared.net 25
Trying 202.160.112.35...
Connected to a.mx.onesquared.net.
Escape character is '^]'.
220 a.mx.onesquared.net ESMTP

Trying 202.160.112.37...
Connected to backup.mx.onesquared.net.
Escape character is '^]'.
220 backup.mx.onesquared.net ESMTP


Looks like IronPort's to me - is it possible the IP address you're testing from has a poor reputation in SenderBase?

http://www.senderbase.org/ to check

� Scott



On Sat, Dec 11, 2010 at 6:07 PM, Mark Derricutt <mark@talios.com> wrote:
Seems a.mx.onesquared.net and backup.mx.onesquared.net are no longer
accepting connections ( since last night ). �I raised a support ticket
and never heard back from them.

Mark


--
"Great artists are extremely selfish and arrogant things" � Steven
Wilson, Porcupine Tree
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