how to change name of outgoing email

[LKrticka at unreal.cz]

Hello 
I need help, 
while i report bug to my bugzilla, I recieve email from 
www at black.utp.unreal.cz 
that domain is ok, but where can i change the name "www" to "bugzilla" 
( freebsd 4.7, apache 1.36, bugzilla 2.16.3) 

                        Lada
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