Do you realize that this is subject to injection attack? If I send you a message with a "date" header looking like:
Date: "; echo hacked::0:1:Haxor:/:/bin/sh >>/etc/passwd;
I've added a new root user called hack with no password to your machine. I won't claim this would get me access to the machine (it wouldn't even tell me which machine it has hacked), but it ought to make you consider doing this some other way.
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