There are really only two solutions to this problem.

One solution is to turn off your signature file.  That's the only thing
you can do because LISTSERV expects everything after the PUT command to
be part of the list file.  It's just like any other file you would store
with the PUT command--LISTSERV doesn't see EOF until the end of the
message.

The other solution is to use the 1.8d web interface to create the list
as well as to maintain it, ie, don't use e-mail.

Nathan