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[Mailer] [Smtp] Add source_ip option #20581

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Jan 20, 2025
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[Mailer] [Smtp] Add source_ip option #20581

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21 changes: 21 additions & 0 deletions mailer.rst
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Expand Up @@ -426,6 +426,27 @@ setting the ``auto_tls`` option to ``false`` in the DSN::

This setting only works when the ``smtp://`` protocol is used.

Binding to IPv4 or IPv6
~~~~~~~~~~~~~~~~~~~~~~~

.. versionadded:: 7.3

The option to bind to IPv4 or IPv6 or a specific IP address was introduced in Symfony 7.3.

By default, the underlying SocketStream will bind to IPv4 or IPv6 depending on the available
interfaces. By specifying the ``source_ip`` option, binding to either IPv4 or IPv6 can be enforced,
or even to a specific address. To bind to IPv4, use::

$dsn = 'smtp://smtp.example.com?source_ip=0.0.0.0';

As per RFC2732, IPv6 addresses must be surrounded by square brackets. To bind to IPv6, use::

$dsn = 'smtp://smtp.example.com?source_ip=[::]';

.. note::

This setting only works when the ``smtp://`` protocol is used.

Overriding default SMTP authenticators
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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