Exchange cookies in pairs.
Do the experiment in pairs:
Log in to your mailbox first and check the automatic login option
After logging in successfully, log out and enter the mailbox again to see if it is automatically logged in. If you log in automatically, export cookies ("File" option in the upper left corner).
Export Fil
And clear the history and cookies, exit. If you don't succeed, do it again.
After exporting the cookies, the two exchange cookies with each other, open a browser, import another person's cookies in the file options, and enter www.126.com to see if the entry is successful.
