Re: [bitfolk] Email - getting out of spam filters

"On Thu, Aug 1, 2013 at 9:00 AM, Phil Stewart wrote: I agree that +all seems rather pointless - sounds like ticking the SPF box at best. But both ~all and ?all are being actively used, by domains such as paypal.com, linkedin.com and google.com - three domains that are very prominent victims of from-address spoofing. In theory, the ability of SPF to tell recipients that they can safely drop all email claiming to come from your domain that doesn't come from a handful of listed IP addresses sounds great - and it that context ?all and ~all seem pointless for anything but testing. In practise, it turns out to be pretty hard to know which addresses email is being sent from from. Which is why ~all ("anything received from IP addresses not listed probably didn't come from us, but we can't be sure") and ?all ("we can't say anything about email received from IP addresses not listed") come in handy. SPF is mostly used in scoring - that's probably the reason behind the odd behaviour noticed by the OP. ?all and ~all allow a receiving spam filter to slightly reduce the spam score for emails received from listed IP addresses, without having it drop anything else. Martijn.