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$ perl -MO=Deparse,-p -e " my ${host_mail} = qq[80.80.80.80]; (my $host_mail = '80.80.80.80'); -e syntax OK
$ perl -MO=Deparse,-p -e " my $ host_mail = qq[80. +80.80.80]; " (my $host_mail = '80.80.80.80'); -e syntax OK