Sendmail

Here is a command you can run to see what COMPILE time options were enabled

sendmail -d0 < /dev/null
Version 8.11.6
 Compiled with: LDAPMAP MAP_REGEX LOG MATCHGECOS MIME7TO8 MIME8TO7
                NAMED_BIND NETINET NETINET6 NETUNIX NEWDB NIS QUEUE SASL SCANF
                SMTP TCPWRAPPERS USERDB

============ SYSTEM IDENTITY (after readcf) ============
      (short domain name) $w = smokey
  (canonical domain name) $j = smokey.enic.cc
         (subdomain name) $m = lan.enic.cc
              (node name) $k = smokey.lan.enic.cc
========================================================