You are looking for a file called sendmail.mc (in RedHat it is found in /etc/mail/). This is the file which produces the file (confusing!) that configures sendmail. There are instructions at the top of the file on how to get the actual sendmail.cf file to be generated from the sendmail.mc file.
The mc file has many comments in it, some clear, some so cryptic as to be useless, but it will get you started. You can google for info on almost every line in the sendmail.mc file for further details.
Cheers--
Charles
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