On Aug 22, 2014, at 7:42 AM, Matthew Huff <[email protected]> wrote: > Currently it is not feasible to do ipv6 reputation filtering. IPv4 reputation > filtering is a big part of most anti-spam engines, so without it, SPF / DKIM > of domain reputation is the best alternative. > > BTW, we have had to remove all IPv6 from our mail gateways due to the large > number of Exchange SBS with broken isatap/6to4 tunnels causing mail to > blackhole.
MTU issue? -d > These have been at small web based retailers which don't have hosted email. > After the third incident, we yanked our IPv6 from our MX/gateways. > > > > ---- > Matthew Huff | 1 Manhattanville Rd > Director of Operations | Purchase, NY 10577 > OTA Management LLC | Phone: 914-460-4039 > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Nick > Hilliard > Sent: Friday, August 22, 2014 10:25 AM > To: Lorenzo Colitti; Laurent GUERBY > Cc: IPv6 Ops list > Subject: Re: SMTP over IPv6 : gmail classifying nearly all IPv6 mail as spam > since 20140818 > > On 22/08/2014 15:16, Lorenzo Colitti wrote: >> Are you following the "Additional guidelines for IPv6" section of >> https://support.google.com/mail/answer/81126 ? > > Lorenzo, > > it looks like Google is trying to enforce SPF / DKIM on ipv6 connections > where there is no similar requirement for ipv4. Is there a particular > reason for this? It's causing a lot of breakage. > > Nick >
