Need to change the source address in sendmail

[jim martin]

Hi.. i am using sendmail in Fedora Core1 to send email.  And I found that my source email address is always root at mylinux.mycompany.com.  mylinux is my hostname and mycompany is my company domain name.  but how can change my source email address to root at abc.com or myname at abc.com??  where is the setting???   Is that in /etc/mail/sendmail.cf ?  But I don't know where should I change.  

		
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