The underlining in red of everything I type

I am finding that when I type an email all the text is being underlined by a red wavy line. It does not show on the recipients e-mail, however it is unnecessary and distracting.

I cannot find a way to stop this happening, any ideas?

Thank you

the text is corrected with a different language
you type english, but the correction thinks your typing Czech.

if you rightclick in the body of the text a long menu appears and one item is the language its compared against.

Thats the default auto spell check where you normally “right click” on the red wavy line which then gives you spelling suggestions.

If you want to disable that, remove the automatic spell check boxes via “Menu / Settings (Preferences Mac) / General / Spell-Checker”. Then click Apply and Save & Close.

(eM Client V10 Settings example)

That has worked! Thank you very much.
J