The text editor will add '=' sign implicitly whenever there is a line break. (When sending Email)

[AOL]

The text editor will add ‘=’ sign implicitly whenever there is a line break.
I tried to send email from the frappe text editor, but the message body I got contains “=”.

The text editor view:

The message I found:

Then I scrolled down, found the same in HTML code:

Another example(just show the code from message):

So it seems like if you use ‘Enter’ in the text editor, there is no problem with line changing.
However, if you just type a paragraph, the text editor will add a “=” to connect the word.

Any direction on how to solve this problem will be much appreciated.
I have looked at the email_body.py but didn’t found anything. frappe/email_body.py at develop · frappe/frappe · GitHub

Also opened a GitHub issue, links here: The text editor will add ‘=’ sign implicitly whenever there is a line break. (Email Sending) · Issue #8207 · frappe/frappe · GitHub

Thank you in advance.

[AOL]

Problem solved, it’s not the text editor’s problem.
It has to do with the email service provider’s encoding method.