feature #14565 [Mailer] Complete mailer documentation (l-vo)

This PR was merged into the 4.4 branch.

Discussion
----------

[Mailer] Complete mailer documentation

Changes of #14083 reported to 4.4.

Commits
-------

074db0d Complete mailer integration

Author: wouterj

mailer.rst

@@ -29,11 +29,58 @@ over SMTP by configuring the DSN in your ``.env`` file (the ``user``,
     # .env
     MAILER_DSN=smtp://user:pass@smtp.example.com:port
 
+.. configuration-block::
+
+    .. code-block:: yaml
+
+        # config/packages/mailer.yaml
+        framework:
+            mailer:
+                dsn: '%env(MAILER_DSN)%'
+
+    .. code-block:: xml
+
+        <!-- config/packages/mailer.xml -->
+        <?xml version="1.0" encoding="UTF-8" ?>
+        <container xmlns="http://symfony.com/schema/dic/services"
+            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+            xmlns:framework="http://symfony.com/schema/dic/symfony"
+            xsi:schemaLocation="http://symfony.com/schema/dic/services
+                https://symfony.com/schema/dic/services/services-1.0.xsd
+                http://symfony.com/schema/dic/symfony https://symfony.com/schema/dic/symfony/symfony-1.0.xsd">
+            <framework:config>
+                <framework:mailer dsn="%env(MAILER_DSN)%"/>
+            </framework:config>
+        </container>
+
+    .. code-block:: php
+
+        // config/packages/mailer.php
+        use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;
+        return static function (ContainerConfigurator $containerConfigurator): void {
+            $containerConfigurator->extension('framework', [
+                'mailer' => [
+                    'dsn' => '%env(MAILER_DSN)%',
+                ]
+            ]);
+        };
+
 .. caution::
 
     If you are migrating from Swiftmailer (and the Swiftmailer bundle), be
     warned that the DSN format is different.
 
+Using built-in transports
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+============ ==================================== ===========
+DSN protocol Example                              Description
+============ ==================================== ===========
+smtp         smtp://user:pass@smtp.example.com:25 Mailer uses an SMTP server to send emails
+sendmail     sendmail://default                   Mailer uses the local sendmail binary to send emails
+============ ==================================== ===========
+
+
 Using a 3rd Party Transport
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
@@ -822,6 +869,8 @@ and it will select the appropriate certificate depending on the ``To`` option::
     $firstEncryptedEmail = $encrypter->encrypt($firstEmail);
     $secondEncryptedEmail = $encrypter->encrypt($secondEmail);
 
+.. _multiple-email-transports:
+
 Multiple Email Transports
 -------------------------
 

reference/configuration/framework.rst

@@ -98,7 +98,7 @@ Configuration
     * `cafile`_
     * `capath`_
     * `ciphers`_
-    * `headers`_
+    * :ref:`headers <http-headers>`
     * `http_version`_
     * `local_cert`_
     * `local_pk`_
@@ -126,7 +126,7 @@ Configuration
     * `cafile`_
     * `capath`_
     * `ciphers`_
-    * `headers`_
+    * :ref:`headers <http-headers>`
     * `http_version`_
     * `local_cert`_
     * `local_pk`_
@@ -151,6 +151,17 @@ Configuration
 
     * :ref:`name <reference-lock-resources-name>`
 
+* `mailer`_
+
+  * :ref:`dsn <mailer-dsn>`
+  * `transports`_
+  * `envelope`_
+
+    * `sender`_
+    * `recipients`_
+
+  * :ref:`headers <mailer-headers>`
+
 * `php_errors`_
 
   * `log`_
@@ -159,7 +170,7 @@ Configuration
 * `profiler`_
 
   * `collect`_
-  * `dsn`_
+  * :ref:`dsn <profiler-dsn>`
   * :ref:`enabled <reference-profiler-enabled>`
   * `only_exceptions`_
   * `only_master_requests`_
@@ -867,6 +878,8 @@ ciphers
 A list of the names of the ciphers allowed for the SSL/TLS connections. They
 can be separated by colons, commas or spaces (e.g. ``'RC4-SHA:TLS13-AES-128-GCM-SHA256'``).
 
+.. _http-headers:
+
 headers
 .......
 
@@ -1075,6 +1088,8 @@ only_master_requests
 When this is set to ``true``, the profiler will only be enabled on the master
 requests (and not on the subrequests).
 
+.. _profiler-dsn:
+
 dsn
 ...
 
@@ -2888,6 +2903,101 @@ Name of the lock you want to create.
             decorates: lock.invoice.store
             arguments: ['@lock.invoice.retry_till_save.store.inner', 100, 50]
 
+mailer
+~~~~~~
+
+.. _mailer-dsn:
+
+dsn
+...
+
+**type**: ``string``
+
+The DSN used by the mailer. When several DSN may be used, use `transports` (see below) instead.
+
+transports
+..........
+
+**type**: ``array``
+
+A :ref:`list of DSN <multiple-email-transports>` that can be used by the mailer. A transport name is the key and the dsn is the value.
+
+envelope
+........
+
+sender
+""""""
+
+**type**: ``string``
+
+Sender used by the ``Mailer``. Keep in mind that this setting override a sender set in the code.
+
+recipients
+""""""""""
+
+**type**: ``array``
+
+Recipients used by the ``Mailer``. Keep in mind that this setting override recipients set in the code.
+
+.. configuration-block::
+
+    .. code-block:: yaml
+
+        # config/packages/mailer.yaml
+        framework:
+            mailer:
+                dsn: 'smtp://localhost:25'
+                envelope:
+                    recipients: ['admin@symfony.com', 'lead@symfony.com']
+
+    .. code-block:: xml
+
+        <!-- config/packages/mailer.xml -->
+        <?xml version="1.0" encoding="UTF-8" ?>
+        <container xmlns="http://symfony.com/schema/dic/services"
+            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+            xmlns:framework="http://symfony.com/schema/dic/symfony"
+            xsi:schemaLocation="http://symfony.com/schema/dic/services
+                https://symfony.com/schema/dic/services/services-1.0.xsd
+                http://symfony.com/schema/dic/symfony https://symfony.com/schema/dic/symfony/symfony-1.0.xsd">
+            <framework:config>
+                <framework:mailer dsn="smtp://localhost:25">
+                    <framework:envelope>
+                        <framework:recipients>admin@symfony.com</framework:recipients>
+                        <framework:recipients>lead@symfony.com</framework:recipients>
+                    </framework:envelope>
+                </framework:mailer>
+            </framework:config>
+        </container>
+
+    .. code-block:: php
+
+        // config/packages/mailer.php
+        namespace Symfony\Component\DependencyInjection\Loader\Configurator;
+        return static function (ContainerConfigurator $containerConfigurator): void {
+            $containerConfigurator->extension('framework', [
+                'mailer' => [
+                    'dsn' => 'smtp://localhost:25',
+                    'envelope' => [
+                        'recipients' => [
+                            'admin@symfony.com',
+                            'lead@symfony.com',
+                        ]
+                    ]
+                ]
+            ]);
+        };
+
+.. _mailer-headers:
+
+headers
+.......
+
+**type**: ``array``
+
+Headers to add to emails. key (``name`` attribute in xml format)
+is the header name and value the header value.
+
 workflows
 ~~~~~~~~~