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my %hash = (       # declare top-level hash
   key => []       # create new empty arrayref with key "key"
...
# that will allow you to get at the first email address
# with the following code:
my $email = $hash{key}[0]{email};

my %hash = ( key => { array => [] } );
push @{$hash{key}{array}}, {
   email => 'email@address',
   timestamp => time
};