When anyone in our organization tries to send an email to a recipent that has an email address external to our domain we get the following error. the email is valid and up until a couple of days ago was working fine:
Delivery has failed to these recipients or distribution lists:
An error occurred while trying to deliver this message to the recipient's e-mail address. Microsoft Exchange will not try to redeliver this message for you. Please try resending this message, or provide the following diagnostic text to your system administrator.
The following organization rejected your message: rblsmtpd.local.
Sent by Microsoft Exchange Server 2007
Diagnostic information for administrators:
Generating server: cybertron.CBCCROSS.ORG
rblsmtpd.local #553 Bogus helo hallmark.com. <http://unblock.secureserver.net/?ip=220.127.116.11