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http://blog.codinghorror.com/so-youd-like-to-send-some-email...

Even if it can't set the PTR it's self, it could at least detect if your PTR is missing or wrong, and display that information to you with some advice on how to resolve it and how important it is.

Thanks for the idea! I've added a test for PTR:

https://github.com/JoshData/mailinabox/commit/ec11241a7a619a...

You might also:

* Test/alert if your PTR mismatches your HELO name

* If your IP is on any of the major RBLs

* Point admins toward AOL/Yahoo/ReturnPath whitelists and feedback loops.

Additionally, you should test whether your PTR "smells" dynamic (i.e. contains part of your IP address in the PTR itself.) It may or may not be something within your control, but you should know as it may cause you problems later.

With dkim/SPF the lack of a reverse ptr is less important. I've had one email bounce as a result, even then the bounce included instructions to resolve the issue with their server.