Hey, Doug, if this is true:

>In the keyword memo for 1.8c, May, 24,'95 (...)

then I suggest you get a newer keyword memo :)  May 24 1995 was the original
release of <1.8b> and I imagine this is simply a mistake in the original
manuals.  Latest LISTKEYW MEMO can be downloaded from FTP.LSOFT.COM in
the DOCUMENTS directory.  Or

 ftp://ftp.lsoft.com/DOCUMENTS/listkeyw.memo

for the browser crowd :)  It currently says

*********************
* Sizelim= <number> *
*********************

If set, causes  LISTSERV to reject all messages to  the list which exceed
the  number of  lines (including  all Internet  header lines)  indicated.
This can be helpful in discouraging subscribers from posting long screeds
or uuencoded  files to  your lists. It  can also be  set higher  than the
LISTSERV default if  desired; check with your  LISTSERV maintainer before
changing this upward. (Generally "Sizelim=  250" is large enough for long
posts but short enough to  discourage postings of uuencoded binaries, but
of course, your mileage may vary.)


Nathan