Apple Mail doesn't work after installing Catalina

After installing Catalina, one of the issues I had on my iMac was my Apple Mail app stopped working. I can't even launch it. I checked with my ISP and there doesn't seem to be anything wrong on their end. I can send and receive emails through Horde but it's a real hassle. One of my accounts is through Comcast and I can send and receive emails through their site. Again kind of a pain. Also, my iPhone sends and receives email without any issues. The Apple Mail icon in my dock is showing messages received in the counter, I just can't access them.

Any suggestions?