Receiving Error 553 Message Rejected, Host IP Address Does Not Resolve
Posted on 2006-03-27
I sm running Exchnage 2000 on Windows 2000 Server SP4, when we receive e-mail from some, not all, users and attempt to reply we get the following error message:
The following recipient(s) could not be reached:
'firstname.lastname@example.org' on 3/27/2006 11:49 AM
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<mail.fthcm.org #5.5.0 smtp;553 message rejected: your host's IP address does not resolve: 18.104.22.168>
Can I get some assistance, please.. We do have an internal DNS server that resolves that IP Address, however, the IP Address is the IP of the ISA Server and not the actual internal e-mail server. Thanks..