[Project] Laravel Advanced Mail

[nerg4l]

Laravel has great mail support which could be extended with two extra feature.

• Middleware for mails.
  With mail middlewares one could add extra filters which modifies/extends the mail object or cancels the send event.
• Failover driver.
  One could register multiple mail driver which would fallback to the next in the row if the current one fails. I just recently experienced this issue with Mailgun which responded with 5xx status code. This could be an other fix next to using jobs for sending mail.

[nerg4l]

My PR to add Failover Swift Transport driver to the core got merged. The PR is available here: laravel/framework#38344