There are almost an infinite variety of bounces, and
list-owners's responses there to.  The question is
why does e-mail bounce?  There are lots of reasons --
some temporary, some permanent, some intermittent.
Lots of discussion in lstown-l and lstsrv-l archives
already on this topic.
 
Only after time and experience will you be able to
recognize what YOU should do when.  In fact, what
you do might change over time, even with plenty of
experience.  Thus, it depends.
 
As far as the "problem" subscription, have the user
cc: you in any e-mail to the LISTSERV.  Then work
with your LISTSERV maintainer as well as your host
site sysadmin (if different) in checking the SMTP
logs (inbound and outbound) as well as any MAILER
involvement (if applicable).
 
Remember, e-mail is NOT symmetrical i.e., just because you
can e-mail me, does not mean that I can e-mail you.
 
--  co-owner INFOSYS, TQM-L, CPARK-L, ERAPPA-L, JANITORS, LDBASE-L, et -L
URL:mailto:[log in to unmask]   "I've fallen and can't reach my keyboard"
31 Shields Bldg. --   Penn State    -- University Park, PA 16802-1202 USA