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docs: suggest mx to refer to mailserver in spf record

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Much more foolproof in simple setups, because it allows all servers
mentioned in a domains MX record to also send out mail, without having to
track them here manually again.
This commit is contained in:
Martin Weinelt
2026-02-26 01:03:53 +01:00
parent 781e833633
commit 034ca15318
1 changed files with 5 additions and 5 deletions
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docs/setup-guide.rst
+5 -5
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@@ -122,18 +122,18 @@ Set a ``SPF`` record
Add a `SPF <https://en.wikipedia.org/wiki/Sender_Policy_Framework>`_
record to the domain ``example.com``.
================ ===== ==== ================================
================ ===== ==== ================
Name (Subdomain) TTL Type Value
================ ===== ==== ================================
example.com 10800 TXT `v=spf1 a:mail.example.com -all`
================ ===== ==== ================================
================ ===== ==== ================
example.com 10800 TXT `v=spf1 mx -all`
================ ===== ==== ================
You can check this with
::
$ nix-shell -p bind --command "host -t TXT example.com"
example.com descriptive text "v=spf1 a:mail.example.com -all"
example.com descriptive text "v=spf1 mx -all"
Note that it can take a while until a DNS entry is propagated.