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Fixed some explanations in the mailer component #12322

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Sep 17, 2019
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Fixed some explanations in the mailer component #12322

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20 changes: 10 additions & 10 deletions components/mailer.rst
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Expand Up @@ -100,15 +100,11 @@ binary. For third-party providers, refers to the following table:
Sendgrid smtp://apikey:KEY@sendgrid n/a api://KEY@sendgrid
==================== ================================== ================================== ================================

Load Balancing
--------------

Symfony's mailer supports `load balancing`_ so you can distribute the mailing
workload across multiple transports. There are two main techniques to balance
the load: failover and round-robin.
High Availability
-----------------

Failover Load Balancing
~~~~~~~~~~~~~~~~~~~~~~~
Symfony's mailer supports `high availability`_ via a technique called "failover"
to ensure that emails are sent even if one mailer server fails .

A failover transport is configured with two or more transports joined by the
``||`` operator::
Expand All @@ -119,8 +115,11 @@ The mailer will start using the first transport. If the sending fails, the
mailer won't retry it with the other transports, but it will switch to the next
transport automatically for the following deliveries.

Round-Robin Load Balancing
~~~~~~~~~~~~~~~~~~~~~~~~~~
Load Balancing
--------------

Symfony's mailer supports `load balancing`_ via a technique called "round-robin"
to distribute the mailing workload across multiple transports .

A round-robin transport is configured with two or more transports joined by the
``&&`` operator::
Expand Down Expand Up @@ -181,4 +180,5 @@ Learn More
To learn more about how to use the mailer component, refer to the
:doc:`Symfony Framework Mailer documentation </mailer>`.

.. _`high availability`: https://en.wikipedia.org/wiki/High_availability
.. _`load balancing`: https://en.wikipedia.org/wiki/Load_balancing_(computing)