Once upon a time, Greg Woods <woods@xxxxxxxx> said: > On Fri, Jul 1, 2016 at 7:16 AM, Chris Adams <linux@xxxxxxxxxxx> wrote: > > No, it isn't specifically a Gmail issue, it is an issue from the > > combination of DMARC strict policies, sites that enforce DMARC policies, > > and mailing lists. > > DMARC, that was it. Thank you for the more detailed (and more correct) > explanation. > > As a Google user, I most often see this in mail coming from Yahoo. Yes, Yahoo is probably the largest user base with a DMARC "p=reject" policy (AOL also has that, but who uses AOL these days? :) ). > And Ed > also makes a good point. I already filter my mailing list mail into > separate labels for each list, and check "Never send to spam" for these, > which removes the DMARC issue. Setting "never send to spam" means you are > relying on the server for the mailing list to do the spam filtering. The problem with whitelisting senders is that malware is smart enough to abuse it (has been for years, but is getting smarter lately). There have been several spam/virus senders lately that recognize mailing lists in people's address books, and then send garbage from a recognized list member address to other members, setting the headers to look like they went through the list server. As soon as you whitelist the list, there's no way for your server to block such garbage messages. Even if the list server sets SPF, DKIM, and/or DMARC, your whitelist entry says to ignore them. It is a tough problem. Ideally, list servers would rewrite the From: address (to avoid DMARC issues), and they'd all have SPF records (which Fedora's list server does), sign messages with DKIM, and have DMARC policies. Then you shouldn't need to whitelist (or at most whitelist from content filters, but not SPF/DKIM/DMARC checks). As mail servers are moving to IPv6, some servers are requiring SPF and/or DMARC to accept email over IPv6, so maybe we'll get a little better experience there. -- Chris Adams <linux@xxxxxxxxxxx> -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://lists.fedoraproject.org/admin/lists/users@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
