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[Mailer] Mention Let's Encrypt as a way to get the needed security certificate #12000

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Jul 23, 2019
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[Mailer] Mention Let's Encrypt as a way to get the needed security certificate #12000

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11 changes: 8 additions & 3 deletions mailer.rst
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Expand Up @@ -546,9 +546,13 @@ Signing and Encrypting Messages
The option to sign and/or encrypt messages was introduced in Symfony 4.4.

It's possible to sign and/or encrypt email messages applying the `S/MIME`_
standard to increase their integrity/security. Both options can be combined (to
encrypt a signed message and to sign an encrypted message) and they require to
have the `OpenSSL PHP extension`_ properly installed and configured.
standard to increase their integrity/security. Both options can be combined to
encrypt a signed message and/or to sign an encrypted message.

Before signing/encrypting messages, make sure to have:

* The `OpenSSL PHP extension`_ properly installed and configured;
* A valid security certificate (you can get it for free from `Let's Encrypt project`_).

Signing Messages
~~~~~~~~~~~~~~~~
Expand Down Expand Up @@ -738,4 +742,5 @@ environment:
.. _`Inky`: https://foundation.zurb.com/emails.html
.. _`S/MIME`: https://en.wikipedia.org/wiki/S/MIME
.. _`OpenSSL PHP extension`: https://php.net/manual/en/book.openssl.php
.. _`Let's Encrypt project`: https://letsencrypt.org/
.. _`PEM encoded`: https://en.wikipedia.org/wiki/Privacy-Enhanced_Mail