I have been trying to send e-mail out today to multiple recipients. However, I keep getting bouncebacks.

Reporting-MTA: dns;blu0-omc2-s27.blu0.hotmail.com
Received-From-MTA: dns;BLU105-DS1
Arrival-Date: Mon, 22 Jun 2009 09:34:30 -0700

Final-Recipient: rfc822;{removed email address}
Action: failed
Status: 5.7.1
Diagnostic-Code: smtp;554 5.7.1 <blu0-omc2-s27.blu0.hotmail.com[65.55.111.102]>: Client host rejected: The sender's mail server is blocked

I am also getting the same error with 65.55.111.111. I confirmed on sorbs.net that the server is tagged for sending spam.

Please advise. Thanks.

Hi EthanJA,  

Based on the bounce notification you provided, the Hotmail domain is being blocked on your recipients end.  I suggest that you contact the support team or domain administrator of the domain involved and inform them about the issue.