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Unbound-related? (DNS Resolver) Go for that one.
Mails nach extern nicht möglich - "loops back to myself"
unable to get cert, not detecting IP?
spamhaus DNS query blocked from inside containers
Problem after update
DNS stopped resolving after recent update
problem with unbound
migration, getting wrong IPv6 address
OUTLOOK dns resolution fails (all others good)
DNS Hilfe für SRV einträge
unbound tries to resolve '.' domain
Postfix: Waiting for DNS...
Unbound DNS andere Zwecke nutzen (DynDNS)
dns resolution does not work
Unbound blockiert Port