Dave Allyn wrote:

Forte Agent has a spell checker built in.

Of course, I ususally forget to use it....

options/posting preferences/spelling/Auto-check spelling on send.

It checks both mail & usenet -- and the new version of Agent has a
vastly improved spellchecker. Not worth the $15 for an upgrade
yet, but I might just do it because I'll be upgrading to 2.1 when
nested folders are available.

Jim