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  1. or download this
    @{ $$href{dn}{mail} };
# or 
@{ $href->{dn}{mail} }; 
# or 
@{ $href->{dn}->{mail} };
  2. or download this
    $$href{$dn}{mail}[0];
# or 
...
# or
$href->{dn}->{mail}->[0]; ## yawn! :)
# or ...
  3. or download this
    ## Make the localised glob *mail 
## act as an alias to the nested array
...
} 
## *mail reverts to it's old value here.