First of all, upgrade Foxmail, if users reflect a large number of a certain problem, it may be a system bug, the attack lion will be regularly collected and then repaired;

Secondly, enter the correct mailbox and password, if prompted by the wrong password, to believe in themselves, and keep clicking, and then suddenly succeeded (I'm so successful);

Lastly, if you are still If you can't, you can search for "domain.ini" file under the folder where Foxmail is installed, open it and save it after clearing the content, and then repeat the second step until you succeed.

The above is the answer to my personal problem, it may not be applicable to everyone, I hope to share it to help you!