How to configure mail to send "plain text" emails

### What Happened?

I do not see any options for sending plain text emails.

### Steps to Reproduce

Cannot find any preferences in the mail app

### Expected Behavior

option to choose/configure sending emails in plain text.

### OS Version

6.x (Odin)

### Software Version

Latest release (I have run all updates)

### Log Output

_No response_

### Hardware Info

_No response_