The recipient agreed to put it at the door and lost it.

Legal analysis: 1. If the courier is lost at the doorman, the courier company shall bear the responsibility.

2. The recipient agrees that the courier will put the parcel in the residential property management office or the unit guard room. If the property manager and the doorman of the unit do not sign for the parcel, there is no custody contract relationship between the property and the owner, the unit and the employee.

3. Even if the property management personnel and the unit doorman sign for the parcel, according to the contract law, "the custody is free, and the custodian will not be liable for damages if he proves that he has no gross negligence." If the parcel is lost, as the residential property and the unit doorman are usually managed free of charge, as long as he can prove that he has no gross negligence, he will not be liable for damages. Because the recipient agreed that the courier would put the parcel in the guard room, the recipient should bear the responsibility at this time.

4. The loss of express parcel should not be compensated according to the "triple tariff loss" of the Postal Law widely used in practice, but according to the actual loss of goods.

Legal basis: Article 39 of the Consumer Protection Law. Disputes between consumers and operators can be resolved through the following channels: (1) settlement through consultation with operators; (2) Requesting consumers' associations or other mediation organizations established according to law to mediate; (three) to complain to the relevant administrative departments; (four) according to the arbitration agreement reached with the operator, submit it to an arbitration institution for arbitration; (5) bring a lawsuit to the people's court.