Description of Problem:
/etc/mail/Makefile contains

userdb.db : userdb
        @makemap -f hash $@ < $<

This is incorrect:  userdb uses a btree, not a hash (see 
/usr/share/doc/sendmail/doc/op/op.ps, page 71 to confirm.)  Consequently,
the Makefile should read:

userdb.db : userdb
        @makemap -f btree $@ < $<

Building userdb.db incorrectly as a hash breaks sendmail:  outbound mail
will not work for any users, regardless of whether they are in userdb or
not.

Version-Release number of selected component (if applicable):


How Reproducible:
100 percent

Steps to Reproduce:
1.  cd /etc/mail 
2.  echo "baabaa:mailname  foofoo" > userdb
3.  make userdb.db
4.  service sendmail restart
5.  echo "heehee" | mail root
6.  tail /var/log/maillog

Actual Results:
Nov 27 22:58:43 localhost sendmail[2050]: fAS3whZ02050:
db_open(/etc/mail/userdb.db): Invalid argument
Nov 27 22:58:43 localhost sendmail[2050]: fAS3whZ02050: deferred:
udbexpand: Invalid argument

Expected Results:


Additional Information: