After I withdraw money from the bank and enter the password, I must sign it. At the Agricultural Bank of China, I have to sign. At the post office, I have to check it. Always making mistakes. Let me sign it. No matter which bank, customers don't need to fill in the receipt now, just print it out by computer for customers to sign. Every receipt has a place marked with the customer's signature. When signing, you can clearly see where the customer's signature is. Sign it. As for the post office, it may not be standardized enough. Just ask before signing.