Den 25. okt. 2015 02:58, skrev Ted Lemon: > On Oct 24, 2015, at 7:40 PM, Randy Bush <randy@xxxxxxx > <mailto:randy@xxxxxxx>> wrote: >> have you >> seen the hoops one has to jump through to smtp over v6 to google? they >> outsource their alleged pain to the rest of the internet. > > No, actually I haven’t. It Just Works for me. I was surprised, but > pleased. > The requirement in v6 that didn't exist in v4 is that you have to have a PTR record for your MTA's IPv6 address before Google wants to let you send SMTP over IPv6. In IPv4, the absence of a PTR record was taken as a spam signal, together with all the other spam signals; in IPv6, they decided to just say "no".