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relay/doc/source/iponly.rst
2026-05-06 11:43:47 +02:00

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.. _iponly:
Hosting without DNS records
===========================
.. note::
This option is experimental and might change without notice.
In case you don't have a domain,
for example in a local network,
you can run a chatmail relay with only an IPv4 address as well.
To deploy a relay without a domain,
run ``cmdeploy init`` with only the IPv4 address
during the :ref:`installation steps <setup>`,
for example ``cmdeploy init 13.12.23.42``.
Drawbacks
---------
- your transport encryption will only use self-signed TLS certificates,
which are vulnerable against MITM attacks.
the chatmail core's end-to-end encryption should suffice in most scenarios though.
- your messages will not be DKIM-signed;
experimentally, most chatmail relays accept non-DKIM-signed messages from IPv4-only relays,
but some relays might not accept messages from yours.