DMBM511623 - Customer contact and data security: contact with third parties: how to handle correspondence from third parties: contents

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1. DMBM511624

   Introduction
2. DMBM511625

   Confirming there is valid written authority for tax credit cases
3. DMBM511626

   Confirming there is valid written authority for all HoD cases except tax credits
4. DMBM511627

   Invalid authority for tax credits
5. DMBM511628

   Invalid authority for all HoDs except tax credits