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33 changes: 33 additions & 0 deletions mailer.rst
Original file line number Diff line number Diff line change
Expand Up @@ -183,6 +183,39 @@ Alternatively, you can pass multiple addresses to each method::
// ...
;

Message Headers
~~~~~~~~~~~~~~~

Messages include a number of header fields to describe their contents. Symfony
sets all the required headers automatically, but you can set your own headers
too. There are different types of headers (Id header, Mailbox header, Date
header, etc.) but most of the times you'll set text headers::

$email = (new Email())
->getHeaders()
// this header tells auto-repliers ("email holiday mode") to not
// reply to this message because it's an automated email
->addTextHeader('X-Auto-Response-Suppress', 'OOF, DR, RN, NRN, AutoReply');

// ...
;

When using a mailer service that supports tags and metadata, consider using the
``TagHeader`` and ``MetadataHeader`` headers instead of the plain text headers::

use Symfony\Component\Mailer\Header\MetadataHeader;
use Symfony\Component\Mailer\Header\TagHeader;

$email->getHeaders()->add(new TagHeader('password-reset'));
$email->getHeaders()->add(new MetadataHeader('Client-ID', '12345'));

If your mailer doesn't support these tag/metadata headers, they are added to the
message as text headers (``X-Tag: password-reset``, ``X-Metadata-Client-ID: 12345``).

.. versionadded:: 5.1

The ``TagHeader`` and ``MetadataHeader`` headers were introduced in Symfony 5.1.

Message Contents
~~~~~~~~~~~~~~~~

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