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sed prepend text ?

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http://www.unix.com – Hi, I have a file with email header information. I would like to change the Subject line. Code: Subject: ** PROBLEM Host Alert: server.domainname is DOWN ** I'd like to change this line such as to look, Code: Subject: serverID ACK Fw: ** PROBLEM Host Alert: server1.domainname is DOWN** How can I edit this? sed or anything else is fine. Note: server1.domainname, is not always constant it could be server2, server3.domainname up until server30.domainname (HowTos)