You need lb64 only if:
 
1. You want  to update internal files with records  longer than 80 bytes.
   For  instance, the  entire  list  (as opposed  to  the  header), or  a
   FILELIST, or some  file you are making available and  that is designed
   to be printed in landscape mode.
 
AND:
 
2. The mail  path between your machine and LISTSERV's  machine isn't able
   to handle messages with  lines longer than 80. This could  be due to a
   gateway in  the middle,  or to  the fact that  the LISTSERV  host runs
   XMAILER  R2.08 or  older,  or  that its  mailer  and/or  SMTP are  not
   configured  properly,   or  then  it   could  be  the   BITEARN  NODES
   registration which is incorrect.
 
At any rate,  I would say that nowadays most  "active" LISTSERV sites can
receive "wide" mail  from any system directly connected  to the Internet.
If you're sending via a BBS or UUCP, that may be another matter depending
on where your  gateway is. But, of course, in  absolute numbers there are
still 57 servers that can't handle wide mail (only one of which is on the
backbone).
 
  Eric