How to add a text version of an email (text/plain)?

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Newbie22020-12-09 11:27:32

Email

Newbie2, 2020-12-09 11:27:32

Welcome all.
I'm setting up my mail (Yandex.pdd) and I can't pass the test https://www.mail-tester.com/

I can't pass these two tests:

-0.635 HTML_MIME_NO_HTML_TAG HTML-only message, but there is no HTML tag Your message
must contain a tag<html>

There was a similar question from another user, but he sent letters with scripts, and I used my hands through the Yandex web interface.

How do I add a text version of an email and an html tag? I did not find anything similar in the Yandex settings.