Ok! Thunderbird it is. Thing is, nobody told me about going into Xfinity email and ALLOWING a third party client. I figured that out and it’s working now!
Thanks to all!
Well T-Bird is made by Mozilla who a few years ago, vowed to help fight right wing disinfo. Try Evolution which does the same thing plus has added capabilities.
https://wiki.gnome.org/Apps/Evolution
https://en.wikipedia.org/wiki/GNOME_Evolution