My client is getting this bounce back for some domains...
Your message did not reach some or all of the intended recipients.
Subject: RE: some subject
Sent: 06/06/2011 1:56 PM
The following recipient(s) cannot be reached:
'alvin@somedomain.com' on 06/06/2011 1:56 PM
550 5.7.1 p56Ku4Nq002974 This message does not comply with
required standards.
Your message did not reach some or all of the intended recipients.
Subject: RE: some subject
Sent: 06/06/2011 1:56 PM
The following recipient(s) cannot be reached:
'alvin@somedomain.com' on 06/06/2011 1:56 PM
550 5.7.1 p56Ku4Nq002974 This message does not comply with
required standards.