sub breakEmailAddress
{
   my ($components, $counter, $address) = @_;
   @$components = split('@', $address);
   @$counter    = split('@', $address);
}

my(@first,@second);
breakEmailAddress(\@first, \@second, 'john@some.domain.com');
print "FirstArr: @first\n";
print "SecondArr: @second\n";