Spool Using Memory

When you use spooling to store the emails to memory, they will get sent right before the kernel terminates. This means the email only gets sent if the whole request got executed without any unhandled Exception or any errors. To configure swiftmailer with the memory option, use the following configuration:

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# app/config/config.yml
swiftmailer:
    # ...
    spool: { type: memory }

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<!-- app/config/config.xml -->

<!--
    xmlns:swiftmailer="http://symfony.com/schema/dic/swiftmailer"
    http://symfony.com/schema/dic/swiftmailer
    http://symfony.com/schema/dic/swiftmailer/swiftmailer-1.0.xsd
-->

<swiftmailer:config>
     <swiftmailer:spool type="memory" />
</swiftmailer:config>

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// app/config/config.php
$container->loadFromExtension('swiftmailer', array(
     // ...
    'spool' => array('type' => 'memory')
));

Spool Using a File

In order to use the spool with a file, use the following configuration:

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# app/config/config.yml
swiftmailer:
    # ...
    spool:
        type: file
        path: /path/to/spool

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<!-- app/config/config.xml -->

<!--
    xmlns:swiftmailer="http://symfony.com/schema/dic/swiftmailer"
    http://symfony.com/schema/dic/swiftmailer
    http://symfony.com/schema/dic/swiftmailer/swiftmailer-1.0.xsd
-->

<swiftmailer:config>
     <swiftmailer:spool
         type="file"
         path="/path/to/spool" />
</swiftmailer:config>

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// app/config/config.php
$container->loadFromExtension('swiftmailer', array(
     // ...

    'spool' => array(
        'type' => 'file',
        'path' => '/path/to/spool',
    ),
));

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path: "%kernel.root_dir%/spool"

Now, when your app sends an email, it will not actually be sent but instead added to the spool. Sending the messages from the spool is done separately. There is a console command to send the messages in the spool:

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$ php app/console swiftmailer:spool:send --env=prod

It has an option to limit the number of messages to be sent:

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$ php app/console swiftmailer:spool:send --message-limit=10 --env=prod

You can also set the time limit in seconds:

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$ php app/console swiftmailer:spool:send --time-limit=10 --env=prod

Of course you will not want to run this manually in reality. Instead, the console command should be triggered by a cron job or scheduled task and run at a regular interval.