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List:       spamassassin-users
Subject:    Re: SPF_NONE scoring
From:       Dave Warren <dw () thedave ! ca>
Date:       2021-12-03 1:24:23
Message-ID: 295558e7-f4c3-59a6-38c8-0d9744288afa () thedave ! ca
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On 2021-11-30 12:24, Greg Troxel wrote:
> Lots of people think SPF is silly.  And spammers spamming from a domain
> they control can even dkim/dmarc.

Domain based reputation is an extremely powerful tool, but it is only 
useful when you know the actual sender of a message. The benefit isn't 
in blocklisting, it is enabling legitimate mail to get through while you 
can filter more aggressively.

This applies a lot less to smaller operations as you really need a large 
amount of data (and the skills to use it), but even at small scales 
being able to bypass spam filters for mail you know you want is 
incredibly useful, especially when you want mail from a particular 
company even though they use a garbage ESP or service provider that you 
would really rather block.


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