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Cost: $1.75 Service: Provides proof of delivery and the recipient's correct delivery address if different than what was used. Mail Class: Express Mail®. Also available for First-Class Mail®, Priority Mail®, Parcel Post® and Media Mail™ when purchased in conjunction with Cerfitied Mail, Insured Mail (greater than $50), or Registered Mail®. Form Required: USPS Form 3811. Complete and attach the form above the delivery address and to the left of the postage.