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Document reverse DNS setup recommendations

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Michael Wyraz 2019-11-15 19:47:55 +01:00
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docs/dns.rst
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@ -49,6 +49,23 @@ And for another domain, ``myotherdomain.com`` for example:
Note that both point to the same mail server hostname, which is unique to your server.
Reverse DNS entries
-------------------
For a mail system, it's higly recommended to set up reverse DNS as well. That means, if your hostname
``mail.mydomain.com`` resolves to ``a.b.c.d``, the IP ``a.b.c.d`` should also resolve back to the same hostname.
You can verify this with
.. code-block:: bash
nslookup a.b.c.d
Reverse DNS must be set up by the "owner" of the IP address which is usually your hosting provider. You can look it up with ``whois a.b.c.d`` in most cases.
With incorrect reverse DNS setup, most mail systems will reject you emails as spam.
DKIM/SPF & DMARC Entries
------------------------