postfix:
> Mail from our system wasn't accepted oftentimes by Google either.
> I discovered the following solution: Our mail server has got two IPv6
> addresses in the open Internet, one is specific, the other one
> automatically created. The first one was in the DNS, the second one not.
> I noticed that many times messages where sent using the automatically
> generated IPv6 address, which were the mails Google rejected. Since I
> introduced the automatically generated IPv6 address into the DNS, Google
> accepts all mail from our server.
Solutions other than turning off IPv6 autoconfiguration on servers:
- Specify all Postfix IP addresses in main.cf:inet_interfaces.
/etc/postfix/main.cf:
inet_interfaces = 1.2.3.4 127.0.0.1 1:2:3:4:5:6:7:8 ::1
- Specify the Postfix IPv6 address in master.cf:
/etc/postfix/master.cf:
relay ... smtp -o smtp_bind_address6=1:2:3:4:5:6:7:8
smtp ... smtp -o smtp_bind_address6=1:2:3:4:5:6:7:8
Wietse
