Hello, I think it would be very useful that the Email / alias used to send an email from can be set by a rule based on the recipient of the Email. As a concrete example: In my line of work I have exactly one Email-address for communicating my business partner, and all Emails should be sent from this one address. Each time I am writing an Email (or even when clicking on certain links in their message to open an answer) I have to manually select the address I have to sent the email from. This is problematic, not only for the extra step but also for the possibility that I forget to change the sender-email.

It would also benefit privacy because it could prevent accidentally revealing your standard email address.