smtp error 554 5.4.5

Ok here is a weird one.

I can't find info on this error anywhere I have looked.

Arrival-Date: Fri, 13 Aug 2010 23:00:14 -0400
Reporting-MTA: dns; ecout2

Diagnostic-Code: smtp; 554 5.4.5 [internal] Delivery not attempted (maximum retries)
Action: failed
Final-Recipient: rfc822; ccarric@lmha.org
Last-Attempt-Date: Fri, 13 Aug 2010 23:00:14 -0400
Status: 5.4.5



This message was created automatically by the mail system (ecelerity).

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:

>>> ccarric@lmha.org (while not connected): 554 5.4.5 [internal]
>>> Delivery
not attempted (maximum retries)

The sender claims he can can send attachments to the address, but we have received attachments from him as recent as Friday. He received this message tonight on a NDR
rfrantaAsked:
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moorhouselondonCommented:
What I think it means is that a recipient SMTP server could not be found to handshake the request with.  This could either be because there is no connection, too much traffic, or maybe your broadband provider has suspended port 25 outgoing due to spam emanating from the outgoing IP.
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