5.1.2 - Bad destination host 'DNS Hard Error looking up

This is a pretty straightforward error indicating that there was an MX lookup error. What is the rest of the error message (include the specific domain, not a placeholder)? Have you checked the DNS for your domain to make sure all is well? Do a DNSreport here: http://www.dnsstuff.com/ What are you using for a spam filter? Some spam relay services can cause this issue.

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