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It seems mailman, by default, spoofs its outgoing message with the "from" address of the person who posted the message. The envelope mail-from is not spoofed, but rather the P2 FROM. Is this configurable to d a send-on-behalf or simply change to some other static address?

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(Begin unhelpful.) The From: header is defined to be the address of the person who logically originated the message. Mailman isn't spoofing it any more than it spoofs Date: or other headers is preserves. Why do you want to change it? (End unhelpful.) –  jon Dec 14 '11 at 1:25
    
some spam filters don't like the fact that mail is originating for a domain from an MTA that isn't allowed to send as that domain, even if it is a "soft spoof" of only the P2 FROM. –  Ode Dec 14 '11 at 22:00
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The From: address should never be a part of "spoof-filtering". The envelope sender (MAIL FROM) is used in SPF checks. They differ in your case and can differ. –  mailq Dec 15 '11 at 0:00
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