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Queue email

 

When sending email from your application, using queuing process can reduce the application response time and increase speed.

By sending the message to queue instead of sending directly at the end of server response, you may achieve better user experience. Once messages are in queue, you just need a scheduled cron task to initiate scheduled email sending.

How ?

Queuing is simple in Drupal 8

Let's imagine you have a module that currently send an email using mail plugin to multiple users:

foreach (User::loadMultiple($users) as $account) {
    \Drupal::service('plugin.manager.mail')->mail(
            'my_module,
            'my_key',
            $account->getEmail(),
            $account->getPreferredLangcode(),
            $params,
            $from->mail,
            TRUE
         );
}

 

To direct message to queue instead, you can replace with queue service:

Install and use Swift Mailer in Drupal 8 (part 2 : implementation)

In previous article we explained how we installed the Swift Mailer module and its dependencies.

In this second part, let's see how we configure and implement it to use in our modules to send formated HTML mail with attachment.

First you will need to have Mail system module installed already. There is no particular issue or difficulty here.

 

1) Configure Swift Mailer

 

In Swift Mailer configuration (/admin/config/swiftmailer/transport) , we select the following options:

Transport: