$ ./testpl.pl bryan@domain1.net
Can't use string ("0") as a symbol ref while "strict refs" in use at ./testpl.pl line 29.
$ cat -n testpl.pl | grep 29
    29  open (@checkuser_output, "checkuser $user{'name'}\@$user{'domain'} $domain_action{$user{'domain'}}") || die "Failed: $!\n";