UNIX sendmail question

I have root privilege to an UNIX server. I am using UNIX sendmail (/var/sendmail) from within my application code to send out emails from the server. How do I know the current email setup (like what exchange server it goes to, etc.) on the server?
If the sendmail process fails from my application on the server, where should look at for the fix?

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> How do I know the current email setup
senmail.cf usually found in /etc or /etc/mail
depending on your OS there might be a senmail.m4 which generates sendmail.cf

> where should look at for the fix?
/var/log/{messages,mail} or /var/adm/{messages,mail}

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