Gmail MX over IPv6

[Geert Hendrickx]

On Thu, Jun 21, 2012 at 15:40:58 -0400, James Cloos wrote:
> >>>>> "MN" == Mansoor Nathani <jkrolan at mnathani.com> writes:
> 
> MN> Since Gmail has enabled AAAA records for some of its MX hosts, my IPv4 only
> MN> machine gets the Gmail IPv6 address and attempts to deliver email. Its only
> MN> when the timeout has been reached will it try the IPv4 address.
> 
> Your log shows that you use postfix.
> 
> Add this:
> 
> smtp_address_preference = ipv4
> 
> to main.cf to tell postfix to use only ipv4 for outgoing smtp.
> 
> The postconf(5) man page explains:
> 
> ,----< excerpt from postconf(5) >
> | smtp_address_preference (default: any)
> |        The address type ("ipv6", "ipv4" or "any") that the Postfix SMTP client
> |        will  try  first,  when  a destination has IPv6 and IPv4 addresses with
> |        equal MX preference. This feature has no effect unless the  inet_proto‐
> |        cols  setting enables both IPv4 and IPv6.  With Postfix 2.8 the default
> |        is "ipv6".
> | 
> |        This feature is available in Postfix 2.8 and later.
> `----
> 
> That doc snippit reminds me that you could instead add:
> 
> inet_protocols = ipv4
> 
> to do the same thing.


No, this will disable IPv6 for inbound connections as well.


	Geert


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