* Viktor Dukhovni <postfix-us...@dukhovni.org> 2015.01.06 17:25:

> Do this instead:
> 
>     main.cf:
>       ipv4_interfaces = 188.138.4.217
>       ipv6_interfaces = 2001:470:1f0b:bd0::3
>       inet_interfaces = $ipv4_interfaces, $ipv6_interfaces
>       inet_protocols = ipv4, ipv6
> 
>     master.cf:
>       smtp-ipv6  unix  -       -       -       -       -       smtp
>           -o smtp_header_checks=pcre:$config_directory/header_checks_smtp_out
>           -o inet_protocols=ipv6
>           -o inet_interfaces=$ipv6_interfaces
>       smtp-ipv4  unix  -       -       -       -       -       smtp
>           -o smtp_header_checks=pcre:$config_directory/header_checks_smtp_out
>           -o inet_protocols=ipv4
>           -o inet_interfaces=$ipv4_interfaces
> 

Neat! Thanks for the suggestion Viktor. Eventually implemented like this:

smtp      unix  -       -       -       -       -       smtp
  -o smtp_header_checks=pcre:$config_directory/header_checks_smtp_out
smtp-ipv4 unix  -       -       -       -       -       smtp
  -o smtp_header_checks=pcre:$config_directory/header_checks_smtp_out
  -o inet_protocols=ipv4
  -o inet_interfaces=$ipv4_interfaces
smtp-ipv6 unix  -       -       -       -       -       smtp
  -o smtp_header_checks=pcre:$config_directory/header_checks_smtp_out
  -o inet_protocols=ipv6

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