spell

SPELL  -  check spelling

Usage:  SPELL [message-sequence]
  Unless specified, the message-sequence is "current".

The SPELL command uses a speller program to check spelling in messages
  you have received.  (Spell-checking is much more commonly done in messages
  you are writing!--use the SPELL command in SEND MODE.)  The default program 
  (in the variable SPELLER) is "ispell".  

In ispell, type "?" for help or "X" to exit without changing the file.
  For more information on ispell, type "!man ispell" at the MM>
  prompt.  

Example:
    MM>spell 4		#checks spelling on message 4

For more help type "help" and one of these topics:
  message-sequence  edit   set speller