diff --git a/mailer.rst b/mailer.rst
index 1b3e66f2aff..710a14381d1 100644
--- a/mailer.rst
+++ b/mailer.rst
@@ -356,6 +356,54 @@ Other Options
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::
+
+
+ final class CustomTransportFactory extends AbstractTransportFactory
+ {
+ public function create(Dsn $dsn): TransportInterface
+ {
+ // create and return the transport
+ }
+
+ protected function getSupportedSchemes(): array
+ {
+ return ['custom_schema'];
+ }
+ }
+
+Finally, declare the new factory in setting tag the tag `mailer.transport_factory`:
+
+.. configuration-block::
+
+ .. code-block:: yaml
+
+ # config/services.yaml
+ mailer.transport_factory.custom:
+ class: App\CustomTransportFactory
+ parent: mailer.transport_factory.abstract
+ tags:
+ - {name: mailer.transport_factory}
+
+ .. code-block:: xml
+
+
+
+
+
+
+ .. code-block:: php
+
+ // config/services.php
+ $services->set('mailer.transport_factory.custom', App\CustomTransportFactory::class)
+ ->parent('mailer.transport_factory.abstract')
+ ->tag('mailer.transport_factory');
+
Creating & Sending Messages
---------------------------
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