Async emails

[brendt]

I think it makes sense that email classes can be marked as #[Async], in which case they'll be handled by an async command.

[innocenzi]

I think this is a good one to discuss. Would this imply to dispatch a built-in "send email" command asynchronously, with a built-in command handler? Or are you thinking another way?

[brendt]

That's what I was thinking, yeah. If we're sending async mail, we wrap it in an async command, and dispatch it.