In LC mail server setting I see the select box outbound IPv6 address. One of the options is no outbound IPv6 I would expect that then smtp_address_preference = ipv4 is added to /etc/postfix/main.cf but I cannot find it there. I believe my mails are marked spam because recently ipv6 was activated on my vServer and may be postfix is using IPv6 now.
See also http://serverfault.com/questions/565...-and-when-ipv4

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22.11.2016, 10:56 #1
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Why is smtp_address_preference not used?
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22.11.2016, 11:09 #2
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Effectively. I manually added smtp_address_preference = ipv4 and from then on emails arrived normally like before.
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22.11.2016, 11:23 #3
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Please check your logfiles on the exact reasons.
because recently ipv6 was activated on my vServer and may be postfix is using IPv6 now.
It's 2016 - get your IPv6 setup working. More and more ISPs (even T-Mobile Germany!) support and deploy IPv6 for the end users.
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
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22.11.2016, 14:09 #4
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inet_protocols configuration is in fact correctly used by LC and I oversaw that. Except for SPF (DNS still propagating) all seems ready after I followed your suggestion. Already delivered to Gmail via IPv6. Thanks for your encouragement!
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22.11.2016, 14:26 #5
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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.
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