Michael,
 
   LISTSERV does use the mailer from DOMAIN NAMES. LISTSERV applies a
strict interpretation of the file, in that it expects the :nick to be
a complete domain string. Your entry says:
 
------------------ Start of included file DOMAIN   NAMES       -----------------
:nick.BU.EDU        :mailer.MAILER@BOSTONU    BSMTP  3
:site.Boston University Local Area Network
:gatemast.Gatemast@Bostonu
------------------ End   of included file DOMAIN   NAMES       -----------------
LISTSERV interprets this as only applying to node BU.EDU, not to xx.BU.EDU.
This is also the case with MAILER, I believe. You shoould correct the entry
to start ":nick..BU.EDU", as do most others in DOMAIN NAMES.
 
Ross Patterson
Rutgers University