Gnus plaintext email recommendations

[Bartosz Kaczyński]

Hi!

After many attempts, I finally have a working Gnus configuration for 
sending and receiving emails and I am almost ready to switch my workflow 
from Thunderbird to Gnus.
I would like to make sure and adhere to the recommendations outlined in 
the link [1] whether Gnus follows these guidelines by default or if 
there is any additional configuration you can recommend.

My main concern is that when replying to an HTML email, I want to ensure 
that the email doesn't get "lost" HTML part and remains in plain text 
format.
I intend to use Gnus in a work environment, and currently, when I reply 
to a message in Gnus that was received in HTML format, all subsequent 
messages are also in plain text, which causes confusion for other users 
who primarily use Outlook.
I know that this is achievable in applications like Thunderbird, from 
which I am currently composing this message, so I'm wondering how to 
achieve the same effect in Gnus.
The mentioned website [1] includes the following paragraph:

>When users send an HTML email explicitly, convert it to text/plain and 
send a multipart/alternative email which includes both versions.

Thank you in advance for your assistance and any other recommendations 
are welcome!

Regards,
bartk

[1] https://useplaintext.email/