On Mon, 26 Nov 2007 11:58:26 -0500, [log in to unmask] wrote:

>Listserv rejected the message thinking it might have been a command.  OK 
>is not a vailid command (at least not listed on REFCARD).

OK or OK someword
is a valid LISTSERV command as the first line of a message (beginning blank
lines are skipped).  This is the email response to an OK/Confirmation request.
It is not listed in REFCARD and also not listed in Site Managers Manual
Appendix A, or Chapter 6, but it is a valid command.