The check_dns() routine appears to have a minor bug
which produces many warnings of the form:
Can't use string ("$domain") as an ARRAY ref while "strict refs"
in use at plugins/async/require_resolvable_fromhost line 76.
Without really understanding the code, this appears to suppress the
warnings and allow the code continuing to work:
Change:
my $addr = $mx->[0];
to:
my $addr = (ref $mx) ? $mx->[0] : $mx;
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