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[Mailer] docs: add tip about listener priority to mailer.rst #17340

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Oct 18, 2022
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[Mailer] docs: add tip about listener priority to mailer.rst #17340

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8 changes: 8 additions & 0 deletions mailer.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -1056,6 +1056,14 @@ is sent::
}
}

.. tip::

The ``MessageEvent`` is also used internally. Depending on your use case
you might need to set a lower or higher priority for your own listener.
For example, when you want to sign the message, make sure to use ``-1``
or lower so the body has already been rendered and will not change after
signing.

Development & Debugging
-----------------------

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