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[mail-mailboxes] add warning that SMTP server does not reject sender login mismatch #571

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[mail-mailboxes] add warning that SMTP server does not reject sender login mismatch #571

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3 changes: 3 additions & 0 deletions source/mail-mailboxes.rst
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Expand Up @@ -29,6 +29,9 @@ To add a new mailbox to your Uberspace, run the ``uberspace mail user add <mailb
.. tip::
Nothing is shown while entering your password; that’s absolutely correct and works as intended – just enter it blindly and press Enter!

.. warning::
The mail server does not check whether the sender (envelope sender, From: header) of an outgoing mail "belongs" to a certain mailbox. Thus if you have two mailboxes ``alice`` and ``eve``, Eve can also send mails from ``[email protected]``.

.. warning::
While some special characters such as ``.``, ``+``, ``-``, ``_`` are allowed in mailbox names, there are `rules <https://en.wikipedia.org/wiki/Email_address#Local-part>`_ limiting their usage. Please make sure your mailbox name adheres to these rules.

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