head4.letterpagestyle.tex

\documentclass[12pt,sections,headheight=30pt,headinclude,firsthead=false,firstfoot=false,foldmarks=false,foldmarks=blmtP,fromalign=center,fromphone,fromemail,version=last, backaddress=false, subject=titled, twoside, cleardoublepage=current, pagenumber=headright, topright]{scrlttr2}
\renewcommand\pagemark{{\usekomafont{pagenumber}This is page number \thepage\ }}
\usepackage{lipsum}
\usepackage{lastpage}
\RequirePackage[T1]{fontenc}
\usepackage{scrlayer-scrpage}
%\ohead*{\jobname.tex\hspace{0.5cm}\today}
\renewcommand*{\pagestyle}{scrheadings}
%\renewcommand*{\letterpagestyle}{empty}
\begin{document}
\def\today{19th February, 2022}
\begin{letter}{Name}
  \opening{Dear Name,}
  \lipsum
\end{letter}
%\title{Foo}
%\maketitle
\lipsum
\lipsum
\lipsum
\end{document}

%%% Local Variables:
%%% mode: latex
%%% TeX-engine: luatex
%%% TeX-master: t
%%% End: