docs: explicitly mention a reverse DNS entry is required
Fixes https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/issues/234
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@ -96,7 +96,14 @@ Set rDNS (reverse DNS) entry for server
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Wherever you have rented your server, you should be able to set reverse
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DNS entries for the IP’s you own. Add an entry resolving ``1.2.3.4``
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to ``mail.example.com``
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to ``mail.example.com``.
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.. warning::
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We don't recommend setting up a mail server if you are not able to
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set a reverse DNS on your public IP because sent emails would be
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mostly marked as spam. Note that many residential ISP providers
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don't allow you to set a reverse DNS entry.
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You can check this with
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