You mean cryptographic signature?

I have a Tutanota email address and one linked to another external domain and I would like to be able to connect different signatures to each email address.

This will be really useful. I use both a personal and a business email under the same account and I have to erase my personal signature and then append the company one.

We agree that this is quite useful, and we do plan on implementing it sometime in the not so distant future :)