On Wed, 3 Dec 2008 14:46:01 -0500, John Mangione <[log in to unmask]>
wrote:

>I'm putting together a superlist that will include several sublists,
>each of which may contain sublists and/or hundreds of members.
>
>Has anyone come across practical limits to the ultimate number of
>recipients that should be on a list? 

The upper limit may be limited by any one or any combination of the following:

 - LISTSERV License capacity
 - Operating system (e.g. on Windows the 2GB single file size limit limits you 
    to approx. 17,000,000 subscribers in a single list)
 - RAM
 - free disk space
 - available bandwidth
 - single destination domain

>Furthermore, have you found any ways that would improve performance 
>(or, at least not cause the server
>performance to degrade or, worse yet, cause the server to crash)?

If your regular mailings (not necessarily list size, but total mailing size)
will be to 10,000 rcpts or more, talk to your L-Soft Sales Representative about
the HPO (High Performance Option) version of LISTSERV.  Also see
http://www.lsoft.com/products/listserv_perf.asp