There are three reasons for garbled emails: 1. Because the code of the sender's country and region is different from that of Chinese mainland, for example, the general mailbox code in Hongkong, Taiwan Province Province is big5, and it may be displayed as garbled if you check it directly in the free mailbox. 2. The email software tool used by the sender is inconsistent with that used by you. 3. Because the sender mail server mail transmission mechanism is different from the free mailbox mail transmission mechanism.