php mail函数能改邮件头吗？

From <C1><F4><D3><A2><CD><F8> Fri May 13 05:56:56 2011
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Subject: [<C1><F4><D3><A2><CD><F8>] Email <B5><D8><D6><B7><D1><E9><D6><A4>
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 Fri, 13 May 2011 06:56:56 +0100
Date: Fri, 13 May 2011 06:56:56 +0100
From: "<C1><F4><D3><A2><CD><F8>" <[email protected]>
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(envelope-from <[email protected]>)能修改吗？我想修改成mydomain.com这样的，而不是服务器的域名地址