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atomicturtle merged 1 commit into from
Jun 28, 2026
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Warn about consumer and hosted SMTP relay restrictions #344

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13 changes: 13 additions & 0 deletions docs/manual/output/email-output.rst
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Expand Up @@ -10,6 +10,19 @@ There are currently three types of email alerts:
* Granular Notifications to any number of E-mail addresses
* Daily E-mail Reports

.. warning::

**Consumer and hosted SMTP providers** (Gmail, Outlook.com, Yahoo, and similar)
generally do **not** allow unauthenticated relay from arbitrary servers. OSSEC sends
plain SMTP by default unless you configure authenticated mail (see
:ref:`manual-out-smtp-auth`). For Gmail you typically need an app password, OAuth,
or a relay service — not a bare ``smtp_server`` pointing at ``smtp.gmail.com``.

**Microsoft 365 / Exchange Online** requires authenticated SMTP or a connector;
see `Microsoft's SMTP setup guide
<https://support.microsoft.com/en-us/office/how-to-set-up-a-multifunction-device-or-application-to-send-email-using-microsoft-365-or-office-365-69f58e99-c550-4274-ad18-c805d654b4c4>`_.
Use :ref:`manual-out-smtp-auth` when your provider requires TLS and credentials.

.. warning::

Single E-Mail Notification must be setup before Granular Notification
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