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On Thu, 1 Apr 2010, Martijn Grooten wrote:
We were talking about SPF here a few months ago and since then I have noticed that a few people post to the list from IP addresses that don't match the SPF record of their domains. Usually the envelope-from is an address on a personal domain or a webmail account, but the mail is sent through an ISP. The list software doesn't block but adds a Received-SPF: (soft)fail header. Now whatever you do isn't my business, but because I have an interest in SPF, I wonder if you get away with this: I know many spam filters add a few points to the spam score for failed SPF, while some MTAs even block these connections outright.
How about a polite (private) email to everyone who gets a soft-fail just to let them know?
And while I'm not a fan of SPF myself, but at least my published records seem to work:
Received-SPF: pass (pi.a-squared.co.uk: domain of drogon.net designates
195.10.225.68 as permitted sender) client-ip=195.10.225.68;
envelope-from=gordon+dcglug@xxxxxxxxxx; helo=unicorn.drogon.net;
(I know they didn't for a while though!)
Gordon
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