This let's you build complex reply forms selectable when you decide to reply to a message, or by an auto-reply filter. UUCP Support Custom Mail Driver. That's how the UUCP support was added. A separate on-demand text editor. Sure, many mailers do.
Spelling checker is smart enough to skip quoted material.
Includes options for checking a single word, a block of works, from the current cursor position, or the entire file. Flexible Address Groups that can be used for large bulk mailings. Access lists of addresses stored in text files, if desired.