My customer recently had some emails bouncing back with the error that stated "There was a SMTP communication problem with the recipient's email server. Please contact your system administrator" and "<Customer.com #5.5.0 smtp;550-(Customer.com) [1.2.3.4] is currently not permitted to relay through>". I dont have a MX record pointing at the Exchange server on the SBS 2003 R2. I also dont have a smart host setup at this time? But we do have a static ip on the router for the outside and also have access to our dns records at out host. Can anyone tell me a proper way to deal with this problem? Thanks.
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