Alacritty (with tmux if I need a multiplexor)

Have you considered pairing up and doing end-to-end feature development together? That way you can learn from each other.

one for each service

This is very useful for identifying which services might have sold your email to third parties.

Another downside may be that once you’re using your domain for emails, you better make sure you don’t accidentally let it expire or mess up some configuration and start missing emails, which may be important, sent to you