Problem with sending html email. Why is Gmail changing the email structure?

Question

gmail

When sending to mail only in Gmail, new tags are added to the layout of the HTML letter, for example: <div class="gE iv gt">, <div class="aHl"></div>in the layout of the letter itself. I am using a spreadsheet. ims enterprise mailer. The structure collapses and, accordingly, is displayed incorrectly. In rambler everything is displayed normally.

Answer 1

Probably try to make up letters on any of the frameworks.
I myself have been typesetting them on the Zurb Ink Framework for a long time (but unfortunately they have closed)
Now there are other frameworks for typesetting emails, for example these
https://mjml.io
https://emailframe.work/
https://bojler.slicejack .com