Changing the mail addr

[Sandesh Rao]

Hi all.
     When I mail from my internal n/w 
email [EMAIL PROTECTED]
I want the mail to go out with the source address as [EMAIL PROTECTED]
How do I accomplish this
use pine 4.04 for reading mails
sendmail 8.8.7 ,fetchmail 4.5.8 and procmail 3.10

Awaiting comments .
TIA

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