try to install envelopes. is this really worth it???

try to install envelopes.  is this really worth it???

SCCS-vsn: usr.sbin/sendmail/src/alias.c 3.31.1.1
SCCS-vsn: usr.sbin/sendmail/src/deliver.c 3.79.1.1
SCCS-vsn: usr.sbin/sendmail/src/collect.c 3.38.1.1
SCCS-vsn: usr.sbin/sendmail/src/sendmail.h 3.68.1.1
SCCS-vsn: usr.sbin/sendmail/src/parseaddr.c 3.41.1.1
SCCS-vsn: usr.sbin/sendmail/src/savemail.c 3.29.1.1
SCCS-vsn: usr.sbin/sendmail/src/main.c 3.74.1.1
SCCS-vsn: usr.sbin/sendmail/src/readcf.c 3.23.1.1
SCCS-vsn: usr.sbin/sendmail/src/macro.c 3.11.1.1
SCCS-vsn: usr.sbin/sendmail/src/headers.c 3.18.1.1
SCCS-vsn: usr.sbin/sendmail/src/usersmtp.c 3.9.1.1
SCCS-vsn: usr.sbin/sendmail/src/queue.c 3.13.1.1