Martin Weinelt
74 lines
2.6 KiB
ReStructuredText
74 lines
2.6 KiB
ReStructuredText
Autodiscovery
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=============
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`RFC6186`_ defines how email clients can automatically discover a mail server's
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SMTP and IMAP endpoints. To enable this, the following DNS records must be
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configured:
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.. csv-table:: Resource record set
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:header: "Name", "TTL", "Type", "Priority", "Weight", "Port", "Value"
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:widths: 30, 5, 5, 5, 5, 5, 20
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_submissions._tcp.example.com., 3600, SRV, 10, 1, 465, mail.example.com.
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_imaps._tcp.example.com., 3600, SRV, 10, 1, 993, mail.example.com.
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Legacy records
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^^^^^^^^^^^^^^
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The following DNS records are only supported with
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:option:`mailserver.enableSubmission` and :option:`mailserver.enableImap`,
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because they only support connections with explicit TLS. These services are
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disabled by default because they are deprecated through `RFC8314 4.1`_.
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.. csv-table:: Resource record set
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:header: "Name", "TTL", "Type", "Priority", "Weight", "Port", "Value"
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:widths: 30, 5, 5, 5, 5, 5, 20
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_submission._tcp.example.com., 3600, SRV, 20, 1, 587, mail.example.com.
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_imap._tcp.example.com., 3600, SRV, 20, 1, 143, mail.example.com.
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Client support
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^^^^^^^^^^^^^^
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*As researched in March 2026*
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Only a small number of MUAs currently implement this. The most common concern
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from the bigger and security-conscious vendors is lack of widespread DNSSEC
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propagation that could be used to authenticate these SRV records.
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- Aerc: since 0.20.1
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- ``_submissions._tcp`` support submitted in https://lists.sr.ht/~rjarry/aerc-devel/patches/68173
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- Evolution: Since 3.49.3 for mail accounts
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- https://gitlab.gnome.org/GNOME/evolution/-/wikis/Autoconfig
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- https://gitlab.gnome.org/GNOME/evolution/-/issues/941
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Unsupported
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***********
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- DeltaChat:
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- https://github.com/chatmail/core/issues/1508
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- Thunderbird:
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- Desktop: https://bugzilla.mozilla.org/show_bug.cgi?id=342242
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- Android: https://github.com/thunderbird/thunderbird-android/issues/4721
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Vendor-specific autoconfig
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^^^^^^^^^^^^^^^^^^^^^^^^^^
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The `automx2`_ service can provide autoconfig support for Apple's
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`mobileconfig`_, Microsoft's `Autodiscover`_ and Mozilla's `Autoconfig`_
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standards. It does however lack support for multiple mail domains and isn't open for
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contributions due to copyright concerns.
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.. _mobileconfig: https://support.apple.com/de-de/guide/profile-manager/pmdbd71ebc9/mac
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.. _Autodiscover: https://learn.microsoft.com/en-us/exchange/architecture/client-access/autodiscover?view=exchserver-2019
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.. _Autoconfig: https://benbucksch.github.io/autoconfig-spec/draft-ietf-mailmaint-autoconfig.html
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.. _automx2: https://github.com/rseichter/automx2
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.. _RFC6186: https://www.rfc-editor.org/rfc/rfc6186
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.. _RFC8314 4.1: https://www.rfc-editor.org/rfc/rfc8314#section-4.1
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