http://bugzilla.spamassassin.org/show_bug.cgi?id=3615





------- Additional Comments From [EMAIL PROTECTED]  2004-07-19 03:35 -------
Subject: Re:  SPF_(PASS|FAIL|SOFTFAIL) rule doesn't hit when it should

On Sunday 18 July 2004 21:52, you wrote:

> There's not really a good way to detect this reliably; it could also
> have been gatewayed into a mailing list which would then resend
> the msg with a new envelope sender.

Resending the message with a new envelope sender is just what you need, 
because in that case you can check the SPF record of the mailinglist domain. 
Otherwise it is almost guaranteed to fail the check (if the original senders 
domain has an SPF record), since the mailinglist server is probably not in 
the list of authorized clients for the senders domain. Mailinglists *must* 
resend contributions (instead of forwarding them), likewise fetchmail *must* 
rewrite the Return-Path. Checking SPF records will fail miserably if you 
don't do that.

> The workaround is to get the trusted relays to record env-sender in the
> Received header as per
> http://wiki.apache.org/spamassassin/EnvelopeSenderInReceived .

I don't think this is required. With SPF you're only able to check reliably if 
the last untrusted relay before your own trusted relays is legitimately 
sending the message. All information that was added by untrusted relays 
should be discarded anyway (since it can be faked).

Best regards,
Arjen




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