thanks for your help. But I want to change "bounce" to "discard". Beacause When user sent mail to accunt without exist on the server. The postfix system will return back an email with subject "Undelivered Mail Returned to Sender" Automatic. But I don't want it send this message. So I searched google and found just set "bounce unix - - n - 0 bounce" to "bounce unix - - n - 0 discard" can solve this problem.I've check it being Correct. And I have mounts of multi-instances, I want to change the parameter by like "postconf ... ..." or something else,But not by "vi -c /etc/postfix...".
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