On Tue, Mar 25, 2014 at 1:43 PM, Brielle Bruns <br...@2mbit.com> wrote: > On 3/25/14, 11:23 AM, John Levine wrote: >> >> Large mail providers all agree that v6 senders need to follow good >> mail discipline, but are far from agreeing what that means. It >> certainly means proper rDNS, but does it mean SPF? DKIM on all the >> mail? TLS on the connections? At this point, I don't know and >> neither does anyone else. Fortunately we have at least another decade >> of full IPv4 mail connectivity to figure it out. > > > So, what's everyone's feelings about a rather large provider who blocks IPv6 > e-mail that has no RDNS, even though the sending domain has SPF records > allowing the block, and proper DKIM set up? > > *looks directly at Google* > > Nothing like poorly thought out policy to break a rather successful IPv6 > roll-out for multiple customers.
Just an anecdotal observation.... what G appears to be doing is flagging emails, received over IPv6, that are below a certain size threshold. I have zero problems sending bulk emails (discussions lists), over IPv6, to G end users, but I do see consistent problems sending small mgmt alerts (i.e. monit/munin) over IPv6 to G. -Jim P.