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docs/dns: update DKIM TXT instructions

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I recently went through this, and the generated file looks a bit
different than was previously documented.

I opted to be explicit about `k=rsa` (even though [the default is
"rsa"](https://datatracker.ietf.org/doc/html/rfc6376#section-3.6.1)).

I also opted to be explicit about `s=email` ([the default is
"*"](https://datatracker.ietf.org/doc/html/rfc6376#section-3.6.1)).
Honestly not sure what the consequences of this are, I don't know if
DKIM is used for anything besides email.
This commit is contained in:
Jeremy Fleischman 2025-03-13 11:50:56 -05:00
parent c8ec4d5e43
commit a5608fc802
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1 changed files with 6 additions and 5 deletions
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11
docs/setup-guide.rst
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@ -180,18 +180,19 @@ like
::
mail._domainkey IN TXT "v=DKIM1; k=rsa; s=email; p=<really-long-key>" ; ----- DKIM mail for domain.tld
mail._domainkey IN TXT ( "v=DKIM1; k=rsa; "
"p=<really-long-key>" ) ; ----- DKIM key mail for nixos.org
where ``really-long-key`` is your public key.
Based on the content of this file, we can add a ``DKIM`` record to the
domain ``example.com``.
=========================== ===== ==== ==============================
=========================== ===== ==== ================================================
Name (Subdomain) TTL Type Value
=========================== ===== ==== ==============================
mail._domainkey.example.com 10800 TXT ``v=DKIM1; p=<really-long-key>``
=========================== ===== ==== ==============================
=========================== ===== ==== ================================================
mail._domainkey.example.com 10800 TXT ``v=DKIM1; k=rsa; s=email; p=<really-long-key>``
=========================== ===== ==== ================================================
You can check this with