Hello, I'll make an assumption or two. By default, you get Sendmail with RedHat, but there are options for postfix and others. If you are looking for the Sendmail config file, it is normally in /etc (/etc/sendmail.cf) although I would not recommend editing the file directly. There is a file that is usually called sendmail.mc located in /etc/mail (/etc/mail/sendmail.mc) that has your basic Sendmail options in it, and once set, you use the m4 macro processor to generate the more complex sendmail.cf. Read the sendmail.mc file, it should have some instructions at the top of the file. If you are wanting help with something other than Sendmail, please give us more info!
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