[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.
• [x] 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: https://github.com/laravel/framework/pull/38344