# Deactivate middle foldmark in scrlttr2

I would like to remove the middle foldmark, just leaving the upper and lower: I think m should do it but it is not working for me.

\documentclass[a4paper, foldmarks=true, foldmarks=mBT]{scrlttr2}

\setkomavar{fromname}{my name}

\begin{document}

\opening{Dear all,}

This is a letter.

\closing{Yours faithfully,}

\end{letter}

\end{document}


The result of the MWE in the question:

Note, there is an misunderstanding: The longer tick that you see in the middle is not the middle foldmark. It is the punch or center mark and its symbols are P (to activate) and p(to deactivate). So you have to use foldmarks=pBT.

\documentclass[foldmarks=pBT]{scrlttr2}

\setkomavar{fromname}{my name}

\begin{document}

The additional middle foldmark is not required in European letters. Therefore this foldmark is decatived by the DIN.lco which is loaded by scrlttr2 automatically. Inside the DIN.lco is set to zero. So there will be no middle foldmark even if you use foldmark=M.