FEAT: auto-tag based on sender domain

[jsimonetti]

Currently I have a custom mail filter rule for each of my customers' domain to add a tag. It is cumbersome at best.

I would very much appreciate an additional option to auto tag messages from an entire sender domain (and not just a specific user).

[Josua996]

Thanks for the idea - I like it very much! I will try to implement it during the week.