We have a sbs 2003 box and are hosting exchange. For the past week when some of our clients email us they get a bounce back that says:
Your message could not be delivered.
The recipient's computer rejected your e-mail.
Please verify the recipient's e-mail address and resend.
Recipient: <email address>
Reason: 5.7.1 ip address has been blocked by Open Relay Test
When i open the attached doc it says:
Reporting-MTA: dns; priv-edmwes04.telusplanet.net
Arrival-Date: Sun, 10 Jul 2011 21:32:52 -0600
Received-From-MTA: dns; edmwcm03 (ip address)
Final-Recipient: RFC822; <email>
Remote-MTA: dns; mail.rejtool.com (220.127.116.11)
Diagnostic-Code: smtp; 550 5.7.1 ip address has been blocked by Open Relay Test
is this an issue with our server or the senders?