unflag

UNFLAG  -  remove the F indicator from messages

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

The UNFLAG command removes the F indicator from the header line of
  a message.  The F indicator shows that you used the FLAG command
  to mark the message as important.  Use UNFLAG to remove the FLAG.

Example:
    MM>unflag 16

For more help type "help" and one of these topics:
  flag   message-sequence   headers   message-tagging