Automated email responses
Symfony comes with a default mailer library that is based on Swift Mailer 4, the detailed documentation is available from their web site at http://swiftmailer.org.
After a user has signed up to our mailing list, we would like an email verification to be sent to the user's email address. This will inform the user that he/she has signed up, and will also ask him or her to activate their subscription.
To use the library, we have to complete the following three steps:
1. Store the mailing settings in the application settings file.
2. Add the application logic to the action.
3. Create the email template.
Adding the mailer settings to the application
Just like all the previous settings, we should add all the settings for sending emails to the module.yml file for the signup module. This will make it easier to implement any modifications required later. Initially, we should set variables like the email subject, the from name, the from address, and whether we want to send out...
