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To: GetADiplomaOnline
Content-Type: multipart/alternative; 
              boundary=be638aa04b654852d0173c0e3f9b6d20
From: some@email.address.co.uk
to: @huge_list_of_email_addresses

my $email = Email::Simple->new($email_text);
my @headers = $email->header('to');

'header_names' => {
  'content-type' => 'Content-Type',
  'to' => 'To',
...
  'to',
  'Subject'
]