how to change my source address in sendmail??

[ssoss S]

Hi.. i am using sendmail in Fedora Core1 to send mail.  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???

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