Problem : 5.1.2 – Bad destination host ‘DNS Hard Error looking up – what does this mean?
Just received message back from bounce and it states that a completely valid account on our domain can not be delivered mail. Message reads:
5.1.2 – Bad destination host ‘DNS Hard Error looking up….
Solution : 5.1.2 – Bad destination host ‘DNS Hard Error looking up – what does this mean?
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.
