Hellowe are on the way to IPv6 and some question arise about Postfix IPv6 behaviour in dual stack setup.
1.) Do the lookups for AAAA when resolving MX records occur in parallel to A queries, or is some additional latency expected due to the fact that many AAAA queries fail by timeout and others resolving errors?
2.) Do AAAA/ip6.arpa lookup occur on client connects from IPv4 addresses or only when a client connects by IPv6 (name/reverse lookups)?
Additionally any hints and feedback about potential pitfalls from people already doing IPv6 is welcome.
Many Thanks Andreas
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