Spell check is not dependent on Mudcat. It is linked to the program doing the accessing of a site. Yahoo & Hotmail do have resident spell checkers.

Browsers now 'usually' have it, as do mail programs. I use a standalone spell checker that follows everything I try to type no matter where I am...thus I often get 2 checks-- underlined in my browser & 'beeped' at me in TinySpell.