I am getting delivery failure messages from domains that should not be 'Invalid Domains'.
This just started 3 days ago and I am only able to send to domains hosted by my DNS, however, telnet to Surgemail is working correctly from at least 3 different ISP connections.
Anyone have any ideas? SPF records are valid, DNS is valid...nothing has changed and this just started occurring.

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When trying to deliver your message, the mail server at yyyyyy.com encountered
problems with the following addresses:

For <HIDDEN@xx@gmail.com>, Invalid Domain (gmail.com)

For a more detailed explanation see http://netwinsite.com/surgemail/deliver_failed.htm

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When trying to deliver your message, the mail server at yyyyyy.com encountered
problems with the following addresses:

For <HIDDEN@xxx@yahoo.com>, Gave up after 48 hours, last error: DNS lookup failed

For a more detailed explanation see http://netwinsite.com/surgemail/deliver_failed.htm

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When trying to deliver your message, the mail server at yyyyyy.com encountered
problems with the following addresses:

For <HIDDEN@code-crafters.com>, Gave up after 48 hours, last error: DNS lookup failed

For a more detailed explanation see http://netwinsite.com/surgemail/deliver_failed.htm