This option was introduced in Symfony 5.2.

Custom Transport Factories

There is a way to easily create your own custom transport factory in case you need to do something special creating the actual transport.

The new factory needs to implement:class:`Symfony\\Component\\Mailer\\Transport\\TransportFactoryInterface`. To remove some boilerplate you can even extend from:class:`Symfony\\Component\\Mailer\\Transport\\AbstractTransportFactory` which will simplify the new factory::

Finally, declare the new factory in setting tag the tag `mailer.transport_factory`:

..configuration-block::

..code-block::yaml

..code-block::xml

..code-block::php

Creating & Sending Messages