sendmail: Added support the greet_pause feature

sendmail/templates/sendmail.mc.erb

@@ -55,6 +55,9 @@ dnl #
 FEATURE(local_procmail, `', `procmail -t -Y -a $h -d $u')dnl
 FEATURE(`access_db', `hash -T<TMPF> -o /etc/mail/access.db')dnl
 FEATURE(`blacklist_recipients')dnl
+<% if @sendmail_greetpause -%>
+FEATURE(`greet_pause', `<%= @sendmail_greetpause %>')dnl
+<% end -%>
 EXPOSED_USER(`root')dnl
 dnl #
 <% if @sendmail_milter -%>