On Fri, Apr 15, 2022 at 10:36 AM Grant Taylor via mailop <mailop@mailop.org> wrote: > > On 4/15/22 8:24 AM, Al Iverson via mailop wrote: > > Don't send to Gmail over IPv6. > > Drive by comment. > > It is possible to send to Google via IPv6. My personal / small / > bespoke server sends to my Google hosted work address all the time over > IPv6.
You're not wrong. Depends on email volume level and server config. They're just so sensitive to reputation for IPv6 sends, though. Don't even try without SPF and DKIM, and even then, get ready for some possible pain. I think Gmail could be worried that with IPv6 being so broad that somebody could do a spam run targeted at them with each individual message coming from a different IPv6 IP. So I think they are way quicker to drop the hammer and block an IPv6 IP at very low volumes versus an IPv4 IP. (That's a bit of a generalization there, of course.) When I set up a new VPS at a provider, I immediately disable the IPv6 interface and IP. I have never had any sort of broad blocking issues at Gmail with my newest servers. Occasionally I get a content block or trigger something weird-- I accidentally stumbled across a bug in my mailing list manager a couple of weeks ago that would sometimes result in having two message-ID headers and that caused Gmail blocking. But I was able to troubleshoot and fix it. Cheers, Al -- Al Iverson / Deliverability blogging at www.spamresource.com Subscribe to the weekly newsletter at wombatmail.com/sr.cgi DNS Tools at xnnd.com / (312) 725-0130 / Chicago (Central Time) _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
