On Fri, 25 Jul 2014 13:30:43 -0400 "Kevin A. McGrail" <kmcgr...@pccc.com> wrote:
> Even with ptr records and static IPs, etc. we had to add an SPF > record to at least 2 domains in April to get Google to accept the > email over IPv6. Using IPv4, they did not reject. Not sure what > triggers, etc. but that's the reject notice from the SMTP level at > Google logged above. Huh! That's interesting. We have about 320 domains relaying outbound via our service and I'm sure the vast majority do not have SPF records. Our outbound machines always use IPv6 when possible. Google must be using some secret algorithm to decide whether or not to be strict. > Since that time, as a best practice, we have > been adding an SPF record to all domains because our servers are dual > configured with IPv6 and IPv4. I'd love to do that, but we don't control the domains. Try getting 320+ domain owners to understand SPF, let alone implement it. :( I'd rather herd cats... Regards, David.
