Why is smtp_address_preference not used?

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I believe my mails are marked spam

Please check your logfiles on the exact reasons.

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because recently ipv6 was activated on my vServer and may be postfix is using IPv6 now.

then please configure proper Reverse- and Forward DNS for your new IPv6 address.

It's 2016 - get your IPv6 setup working. More and more ISPs (even T-Mobile Germany!) support and deploy IPv6 for the end users.

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See also http://serverfault.com/questio…ix-use-ipv6-and-when-ipv4

Inet_protocols should be the desired setting for this: it also controls the inbound mail sockets:

http://www.postfix.org/postconf.5.html#inet_protocols

Zitat von ñull

Except for SPF (DNS still propagating) all seems ready after I followed your suggestion. Already delivered to Gmail via IPv6. Thanks for your encouragement!

Thank you for another IPv6 deployment

In general: IPv6 behaves like IPv4. It's basically another IP you have to take care of.

As it's also a different protocol stack, some tools (iptables!) have to be considered for IPv6 as well. Apart from that, the same rules apply for IPv6 mail traffic as for IPv4 mail traffic.