usr/src/usr.sbin/sendmail/READ_ME

/*-
 *      @(#)READ_ME     4.3 (Berkeley) %G%
 */

aux             Auxiliary programs, probably all out-of-date.
cf              Configuration files.
delivermail     Source for delivermail(1) (the old /bin/mail).
doc             Documentation.
rmail           Source for rmail(1).
src             Source for the sendmail program itself.