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> Received: from mail-iw0-f176.google.com (biz88.inmotionhosting.com
> by greer.hardwarefreak.com (Postfix) with ESMTP id F297D6C12E
> for <firstname.lastname@example.org>; Thu, 31 Mar 2011 06:29:19 -0500
The format is:
Received: from helo-hostname (verified-reverse-name [ip-address])
This is also useful when setting up backscatter filters: all mail with
a helo-hostname of "porcupine.org", "postfix.org", etc. is a forgery.