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unable to change my user name into postfix

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linux-howto

http://serverfault.com – I have configured my main.cf into postfix, It is sending mail into my gmail account, It is sending mail from abcd@gmail.com, Now I want that the mail should be sent from xyza@gmail.com or acb@mydomain.com, I am stucking with this problem for more than one hour, but I am not getting the solution for this, Please help me out. Thanks in advance Edit: I have configured it, but at gmail server, sender address is showing abcd@gamil.com and I am getting mail delivery fail report from xyza@gmail.com (HowTos)