# Per default sendmail.cf (the MTA aka server configuration) gets automatically
# re-generated from the sendmail.mc file in this directory, when the service
# gets started (see /etc/init.d/sendmail).
# Similar is the procdure for the daemon for maintaining the queue of mail
# submissions from client applications, however, it uses submit.cf usually
# generated from submit.mc instead (see /etc/init.d/sendmail-client).

# Another sendmail.mc example for a fully featured MTA can be found in
# cf/cf/server.mc, or for dumb client machines in cf/cf/client.mc as well as
# cf/cf/linux-client.mc . So copying the according file over to
# /etc/mail/sendmail.mc and restarting the sendmail service should work out of
# the box. 
# Similar copying over cf/cf/submit.mc or cf/cf/submit2.mc to
# /etc/mail/submit.mc and restarting the sendmail-client service should work
# out of the box.

# For more info see sendmail(5) or to understand all the tiny details 
# /usr/share/doc/sendmail/ and there especially op.pdf (package sendmail-docs).