I've been using Thunderbird for 20 years but after their horrible redesign with supernova decided to downloaded to the latest build of Outlook.

I like the layout but the client just seems very lite with not many options. Customization of email signatures is a big thing for me, with tbrid I could link to an html file, can't do that in outlook or add html manually. I can add a table but can't get rid of the borders... I've googled how to do this gto no avail.

Any recommendations for not awful email clients I should try out?