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use Mail::CheckUser qw/ check_email last_check  /;
BEGIN{
...
    $Mail::CheckUser::Treat_Timeout_As_Fail = 1;
    $Mail::CheckUser::Debug = 1;
}

use Net::DNS::Resolver ;
use Data::Dump;
...
  udppacketsize  => 0,
  usevc          => 0,
}, "Net::DNS::Resolver")