How to get rid of HTML composing mails?

[Volker Wysk]

Am Dienstag, 21. November 2017, 13:32:32 CET schrieb Vojtěch Zeisek:
> Hi,
> since yesterday (on openSUSE Tumbleweed, KMail 5.6.3, the most recent KF5), 
> when I compose new mail (answering to plain text mails is usually alright), 
> KMail has started to compose new mails in HTML. It is very annoying as I'm 
> using only plain text and never set KMail to compose mails in HTML. Does 
> anyone else experience the same? How to get rid of it? Now I must every time I 
> write new mail click to the rich text toggle icon to get back to plain text. 
> How to have only plain text mails by default and forever?

Seems like you accidentially clicked on the "Rich Text" button. That's in the message composer window, in the line below the menu bar. Just turn it off again.

This happened to me, once.

Volker