Perform AAAA check separately
#376
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Dependent on the resolver, combined DNS checks for A + AAAA + MX may fail with
SERVFAIL, despite valid A/MX records being present.Case in point:
eripio.xyzon Ubuntu 20.04.6 LTS withsystemd-resolve(and1.1.1.1+8.8.8.8as upstream resolvers):This pull request implements the workaround proposed by @sandermarechal in #301: