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Mail-in-a-Box includes a check like this in its setup script, actually. [I'm the guy behind the project.]

joshdataon Mail-in-a-box: easy to set up modern SMTP/SMTPS server stack

Don't know yet, but if you have thoughts please open an issue!

https://github.com/JoshData/mailinabox/issues

joshdataon Mail-in-a-box: easy to set up modern SMTP/SMTPS server stack

Hi,

Mail-in-a-Box uses 'nsd', which is a non-recursive DNS server. I don't think it can be used to relay DNS queries in a DDOS attack. But if you meant something else, please let me know and/or file a ticket (I don't think I'll be looking here for replies).

https://github.com/JoshData/mailinabox/issues

joshdataon Mail-in-a-box: easy to set up modern SMTP/SMTPS server stack

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

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