Compose - write efficiently with quality

I'd like to be able to add related tags to the message template as well, so that when I use it within an email reply, the tags are automatically added to the reply (based on the template) and I don't have to spend time doing that separately.

Ability to cancel & retrieve an email after sending

Option (perhaps a setting or a rule) to have a different email signature on reply emails than on initial emails. This is available on other platforms. My signature is quite lengthy on purpose, but it doesn’t need to appear on every subsequent repl...

Currently in Outlook, I have the ability to highlight non-contiguous text, copy those items, and paste into an outside application.

Ability to assign a discussion while composing one, instead of having to do it after sending it.

Capabilities for predictive text when composing an email