I guess it depends on how our customers forward to the email account provided by us. I’m sure that there are some messages that we do block due to forwarding, but when I manually examined four weeks of SPF-based blocks, I don’t recall seeing one example. You’re very much right that waiting for feedback from end-users is very much incomplete.
We do not do policy enforcement purely based on SPF unless it is a ”-all”. For all others it’s part of the spam analysis mix. If someone does know the mail operator/group for Travelocity, perhaps they can be alerted to the issue I raised. Frank From: Brandon Long [mailto:bl...@google.com] Sent: Saturday, May 20, 2017 1:56 AM To: Frank Bulk <frnk...@iname.com> Cc: John Levine <jo...@taugh.com>; mailop <mailop@mailop.org> Subject: Re: [mailop] Many SPF failures lately Is forwarding mail something your users never do? Or do you think the sender should be able to specify that the mail can't be forwarded? With the exception of a pure -all record, policy enforcement based purely on spf is a poor choice. Maybe, depending on your users, it won't raise the fp rate that much. OTOH, if you just reject without letting in a fraction, how do you even know what your fp rate is? Waiting for feedback from your users that they're missing messages they may not even know they should have gotten is a poor way to measure effectiveness. Brandon On May 19, 2017 9:34 PM, <frnk...@iname.com <mailto:frnk...@iname.com> > wrote: John, I'm a bit bewildered -- these aren't random strangers, they're the actual sender. Am I supposed to second-guess the sender's instructions? If I have to second-guess every sender's "-all" then I have to have another layer of subjective analysis -- currently manual, in my situation. Frank -----Original Message----- From: John R Levine [mailto:jo...@taugh.com <mailto:jo...@taugh.com> ] Sent: Friday, May 19, 2017 7:22 PM To: frnk...@iname.com <mailto:frnk...@iname.com> Cc: mailop@mailop.org <mailto:mailop@mailop.org> Subject: RE: [mailop] Many SPF failures lately > Yet the senders, via their SPF records with a "-all", told me to reject those messages. As MTA's, we're doing what the send told us to do. I don't know about you, but I do not blindly follow instructions from random strangers. It rarely leads to good outcomes. > For my users, I have the quaint idea that I should try and deliver the > mail that they obviously want. Regards, John Levine, jo...@taugh.com <mailto:jo...@taugh.com> , Taughannock Networks, Trumansburg NY Please consider the environment before reading this e-mail. https://jl.ly _______________________________________________ mailop mailing list mailop@mailop.org <mailto:mailop@mailop.org> https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
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