Boomerang for Apple Mail?

I have tried all exisitng Mail apps but I always fall back to Apple Mail. It’s not perfect but it does the job.

However, I would really really like to see the “boomerang” ( function with a plugin, but I haven’t found a solution.

This must be doable with Automator or something else?

Any ideas?

Mailbutler does this.

On MacOS I use MailTags from Smallcubed

SaneBox also does reminders. Offline delayed send is only available with MailButler in Apple Mail.