Symfony2 SwiftMailer - How to send emails without waiting for the server response
From the Symfony Docs:
# app/config/config.ymlswiftmailer: # ... spool: { type: memory }When you are using the SwiftmailerBundle to send an email from a Symfony2 application, it will default to sending the email immediately. You may, however, want to avoid the performance hit of the communication between Swift Mailer and the email transport, which could cause the user to wait for the next page to load while the email is sending. This can be avoided by choosing to "spool" the emails instead of sending them directly. This means that Swift Mailer does not attempt to send the email but instead saves the message to somewhere such as a file. Another process can then read from the spool and take care of sending the emails in the spool. Currently only spooling to file or memory is supported by Swift Mailer.