How to retry failed mails send swiftmailer

SwiftMailer provides several ways to retry failed emails. Here are a few approaches:

Using the retry option: You can set the retry option to true when sending the email. This will cause SwiftMailer to retry sending the email if it fails. You can also specify the number of retries using the retry_count option.

Example:

$mailer = Swift_Mailer::newInstance($transport);
$message = Swift_Message::newInstance('Subject', 'Body');
$message->setFrom(array('[email protected]' => 'From Name'));
$message->setTo(array('[email protected]' => 'To Name'));
$message->setBody('Body', 'text/plain');

$mailer->send($message, array('retry' => true, 'retry_count' => 3));

In this example, SwiftMailer will retry sending the email up to 3 times if it fails.

Using a custom transport: You can create a custom transport that implements the Swift_Transport interface and overrides the send method to retry sending the email if it fails.

Example:

class MyTransport extends Swift_Transport {
    public function send(Swift_Mime_Message $message, &$failures = array()) {
        $result = parent::send($message, $failures);
        if ($result === false) {
            // retry sending the email
            //...
            return true;
        }
        return $result;
    }
}

Then, you can use this custom transport when creating the SwiftMailer instance:

$mailer = Swift_Mailer::newInstance(new MyTransport($transport));

Using a queue: You can use a message queue like RabbitMQ or Beanstalkd to store failed emails and retry sending them later. SwiftMailer provides a Swift_Queue class that can be used to send emails to a queue.

Example:

$queue = new Swift_Queue('amqp://guest:guest@localhost');
$mailer = Swift_Mailer::newInstance($transport);
$message = Swift_Message::newInstance('Subject', 'Body');
$message->setFrom(array('[email protected]' => 'From Name'));
$message->setTo(array('[email protected]' => 'To Name'));
$message->setBody('Body', 'text/plain');

$mailer->send($message, array('queue' => $queue));

In this example, the email will be sent to the queue instead of being sent immediately. You can then use a worker to consume the queue and retry sending the email if it fails.

Using a third-party library: There are several third-party libraries available that provide retry functionality for SwiftMailer, such as swiftmailer-retry or swiftmailer-queue. These libraries provide a simple way to retry failed emails without having to write custom code.

Remember to always handle exceptions and errors properly when sending emails, as failed emails can be a common occurrence.

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How to retry failed mails send swiftmailer