[prev in list] [next in list] [prev in thread] [next in thread] 

List:       postfix-users
Subject:    Re: Google rejecting IPv6 mails
From:       wietse () porcupine ! org (Wietse Venema)
Date:       2013-10-08 10:48:34
Message-ID: 3cvFfB6fsGzjymp () spike ! porcupine ! org
[Download RAW message or body]

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
[prev in list] [next in list] [prev in thread] [next in thread]