Possibly some spam protection service that is checking reverse DNS.

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Kim
Schotanus
Sent: Wednesday, April 28, 2004 7:50 AM
To: Exchange Discussions
Subject: envelope error


Has anyone seen this error yet? 

There was a SMTP communication problem with the recipient's email server.
Please contact your system administrator. <morpheus.intas.be #5.5.0 smtp;550
envelope mail from can't be verified. mail is rejected.> Kim

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