Oh, found it. Also an other thread from 2025 with a link to “plain text email patch”, which is good to know. Also the issue of not being able to set the folder where sent emails are stored, and font size are mentioned. As they are in this one from 2023.
Bug archeology 
. What is considered the best method to support the system email application development for new users? Is a process of listing issues stressful or beneficial?