update copyright notice

update copyright notice

SCCS-vsn: usr.sbin/sendmail/src/READ_ME 8.83
SCCS-vsn: usr.sbin/sendmail/src/trace.c 8.3
SCCS-vsn: usr.sbin/sendmail/src/sysexits.c 8.2
SCCS-vsn: usr.sbin/sendmail/src/usersmtp.c 8.46
SCCS-vsn: usr.sbin/sendmail/src/stats.c 8.4
SCCS-vsn: usr.sbin/sendmail/src/useful.h 8.4
SCCS-vsn: usr.sbin/sendmail/src/headers.c 8.58
SCCS-vsn: usr.sbin/sendmail/src/recipient.c 8.79
SCCS-vsn: usr.sbin/sendmail/src/macro.c 8.11
SCCS-vsn: usr.sbin/sendmail/src/convtime.c 8.3
SCCS-vsn: usr.sbin/sendmail/src/main.c 8.103
SCCS-vsn: usr.sbin/sendmail/src/envelope.c 8.62
SCCS-vsn: usr.sbin/sendmail/src/conf.h 8.151
SCCS-vsn: usr.sbin/sendmail/src/parseaddr.c 8.65
SCCS-vsn: usr.sbin/sendmail/src/domain.c 8.36
SCCS-vsn: usr.sbin/sendmail/src/arpadate.c 8.4
SCCS-vsn: usr.sbin/sendmail/src/err.c 8.33
SCCS-vsn: usr.sbin/sendmail/src/collect.c 8.36
SCCS-vsn: usr.sbin/sendmail/src/stab.c 8.2
SCCS-vsn: usr.sbin/sendmail/src/sendmail.hf 8.3
SCCS-vsn: usr.sbin/sendmail/src/sendmail.h 8.123
SCCS-vsn: usr.sbin/sendmail/src/savemail.c 8.64
SCCS-vsn: usr.sbin/sendmail/src/daemon.c 8.81
SCCS-vsn: usr.sbin/sendmail/src/srvrsmtp.c 8.67
SCCS-vsn: usr.sbin/sendmail/src/clock.c 8.11
SCCS-vsn: usr.sbin/sendmail/src/util.c 8.64
SCCS-vsn: usr.sbin/sendmail/src/readcf.c 8.86
SCCS-vsn: usr.sbin/sendmail/src/deliver.c 8.144
SCCS-vsn: usr.sbin/sendmail/src/queue.c 8.79
SCCS-vsn: usr.sbin/sendmail/src/conf.c 8.151
SCCS-vsn: usr.sbin/sendmail/src/alias.c 8.44
SCCS-vsn: usr.sbin/sendmail/src/udb.c 8.19
SCCS-vsn: usr.sbin/sendmail/src/map.c 8.56
SCCS-vsn: usr.sbin/sendmail/src/mci.c 8.16