symfony/src/Symfony/Bundle/SwiftmailerBundle/Resources/config/swiftmailer.xml

<?xml version="1.0" encoding="UTF-8" ?>

<container xmlns="http://www.symfony-project.org/schema/dic/services"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.symfony-project.org/schema/dic/services http://www.symfony-project.org/schema/dic/services/services-1.0.xsd">

  <parameters>
    <parameter key="swiftmailer.class">Swift_Mailer</parameter>

    <parameter key="swiftmailer.transport.smtp.class">Swift_Transport_EsmtpTransport</parameter>
    <parameter key="swiftmailer.transport.sendmail.class">Swift_Transport_SendmailTransport</parameter>
    <parameter key="swiftmailer.transport.mail.class">Swift_Transport_MailTransport</parameter>

    <parameter key="swiftmailer.transport.failover.class">Swift_Transport_FailoverTransport</parameter>
    <parameter key="swiftmailer.spool.file.class">Swift_FileSpool</parameter>

    <parameter key="swiftmailer.init_file">%swiftmailer.base_dir%/swift_init.php</parameter>

    <parameter key="swiftmailer.plugin.redirecting.class">Swift_Plugins_RedirectingPlugin</parameter>
    <parameter key="swiftmailer.plugin.blackhole.class">Swift_Plugins_BlackholePlugin</parameter>
  </parameters>

  <services>
    <service id="swiftmailer.mailer" class="%swiftmailer.class%" public="false">
      <argument type="service" id="swiftmailer.transport" />
      <file>%swiftmailer.init_file%</file>
    </service>

    <service id="swiftmailer.transport.smtp" class="%swiftmailer.transport.smtp.class%" public="false">
      <argument type="service" id="swiftmailer.transport.buffer" />
      <argument type="collection">
        <argument type="service" id="swiftmailer.transport.authhandler" />
      </argument>
      <argument type="service" id="swiftmailer.transport.eventdispatcher" />

      <call method="setHost"><argument>%swiftmailer.transport.smtp.host%</argument></call>
      <call method="setPort"><argument>%swiftmailer.transport.smtp.port%</argument></call>
      <call method="setEncryption"><argument>%swiftmailer.transport.smtp.encryption%</argument></call>
      <call method="setUsername"><argument>%swiftmailer.transport.smtp.username%</argument></call>
      <call method="setPassword"><argument>%swiftmailer.transport.smtp.password%</argument></call>
      <call method="setAuthMode"><argument>%swiftmailer.transport.smtp.auth_mode%</argument></call>
    </service>

    <service id="swiftmailer.transport.sendmail" class="%swiftmailer.transport.sendmail.class%" public="false">
      <argument type="service" id="swiftmailer.transport.buffer" />
      <argument type="service" id="swiftmailer.transport.eventdispatcher" />
    </service>

    <service id="swiftmailer.transport.mail" class="%swiftmailer.transport.mail.class%" public="false">
      <argument type="service" id="swiftmailer.transport.mailinvoker" />
      <argument type="service" id="swiftmailer.transport.eventdispatcher" />
    </service>

    <service id="swiftmailer.transport.failover" class="%swiftmailer.transport.failover.class%" public="false" />

    <service id="swiftmailer.transport.mailinvoker" class="Swift_Transport_SimpleMailInvoker" public="false" />

    <service id="swiftmailer.transport.buffer" class="Swift_Transport_StreamBuffer" public="false">
      <argument type="service" id="swiftmailer.transport.replacementfactory" />
    </service>

    <service id="swiftmailer.transport.authhandler" class="Swift_Transport_Esmtp_AuthHandler" public="false">
      <argument type="collection">
        <argument type="service"><service class="Swift_Transport_Esmtp_Auth_CramMd5Authenticator" public="false" /></argument>
        <argument type="service"><service class="Swift_Transport_Esmtp_Auth_LoginAuthenticator" public="false" /></argument>
        <argument type="service"><service class="Swift_Transport_Esmtp_Auth_PlainAuthenticator" public="false" /></argument>
      </argument>
    </service>

    <service id="swiftmailer.transport.eventdispatcher" class="Swift_Events_SimpleEventDispatcher" public="false" />

    <service id="swiftmailer.transport.replacementfactory" class="Swift_StreamFilters_StringReplacementFilterFactory" public="false" />

    <service id="swiftmailer.transport.spool" class="Swift_Transport_SpoolTransport" public="false">
      <argument type="service" id="swiftmailer.transport.eventdispatcher" />
      <argument type="service" id="swiftmailer.spool" />
    </service>

    <service id="swiftmailer.transport.null" class="Swift_Transport_NullTransport" public="false">
      <argument type="service" id="swiftmailer.transport.eventdispatcher" />
    </service>

    <service id="swiftmailer.spool.file" class="%swiftmailer.spool.file.class%" public="false">
      <argument />
    </service>

    <service id="swiftmailer.plugin.redirecting" class="%swiftmailer.plugin.redirecting.class%" public="false">
      <argument>%swiftmailer.single_address%</argument>
    </service>

    <service id="swiftmailer.plugin.blackhole" class="%swiftmailer.plugin.blackhole.class%" public="false" />

    <service id="swiftmailer.transport" alias="swiftmailer.transport.smtp" public="false" />

    <service id="swiftmailer.spool" alias="swiftmailer.spool.file" public="false" />
  </services>
</container>