② Open the file in htm format with Notepad. It's a mess when you open it.
(3) Copy all the garbled characters ctrl+A, Ctrl+C+C.
(4) Open the mailbox, write a letter, and click the Edit Source button, which is the HTML button.
⑤ 163 will appear after finishing.
⑥ Copy ctrl V from the content in ⑥ just now.
⑦ Then re-edit the source text format.