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Re: Reliably distinguishing authorized vs unauthorized users
From: John Adams <mailinglists_at_nospam>Date: Wed Jan 19 2011 - 20:06:41 GMT
To: postfix-users@postfix.org
Am 19.01.2011 21:03, schrieb Ron Garret:
> I am working on a spam filter. I want both incoming and outgoing messages to go through the filter, not because the outgoing messages need to be filtered, but because I want the filter to know who my authorized users have sent messages to because that is a very reliable indicator of non-spam. My setup requires users to authenticate, so postfix knows who they are. My question is: is there a reliable way to pass this information to a filter? I can't find anything about this in the documentation. Reverse engineering indicates that postfix puts an "Authenticated sender" note in the received-from header, but that can be forged. Is there a reliable way for a filter to tell if a message is from an authenticated user?
>
> Thanks,
> rg
>
Yes, spamassassin+amavisd-new.
spamassassin recognizes the authentication header put there by postfix.
There's plenty of documentation around how to do this kind of setup.
John