scott(a)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
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
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