Changing sender email address

[Nguyen, Minh]

RH 2.1AS 
 
For some reason when I send email it set the sender email as user at node.domain.com
 
Is there a setting somewhere I can change to have it just send as user at domain.com?
 
I am a newbie at Admin stuffs, so details is greatly appreciated.
 
Thanks in advance for any advice.
 
 
Minh  <mailto:minh.nguyen at ihe.com> 
 


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