Den 25. okt. 2015 02:58, skrev Ted Lemon:
On Oct 24, 2015, at 7:40 PM, Randy Bush <randy(_at_)psg(_dot_)com
<mailto:randy(_at_)psg(_dot_)com>> 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".