docs: explicitly mention a reverse DNS entry is required

Fixes https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/issues/234
This commit is contained in:
Antoine Eiche 2022-07-10 09:25:43 +02:00 committed by lewo
parent a40e9c3abb
commit 737eb4f398

View file

@ -96,7 +96,14 @@ Set rDNS (reverse DNS) entry for server
Wherever you have rented your server, you should be able to set reverse
DNS entries for the IPs you own. Add an entry resolving ``1.2.3.4``
to ``mail.example.com``
to ``mail.example.com``.
.. warning::
We don't recommend setting up a mail server if you are not able to
set a reverse DNS on your public IP because sent emails would be
mostly marked as spam. Note that many residential ISP providers
don't allow you to set a reverse DNS entry.
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