Why did Gao Dun verify the reliability of the fax reply?

Ensure the accuracy of information and prevent tampering and forgery.

1. Ensure the accuracy of information: A fax reply can be used as evidence to verify the identity of the sender and the authenticity of the information provided, thus ensuring the integrity and correctness of the information.

2. Prevention of tampering and forgery: As a traditional means of communication, fax documents have the characteristics of time stamp and sender's signature, which can provide anti-counterfeiting measures to help identify and prevent tampering and forgery of information.