Latex letter

testletter.tex

% https://www.dickimaw-books.com/latex/admin/html/letter.shtml

\documentclass[12pt]{letter}

\usepackage[a4paper]{geometry}
\usepackage[british]{babel}

\begin{document}

\begin{letter}{Mrs Mabel Canary\\24 The Street\\
Some Village\\Some Town\\Noshire\\AB1 2YZ}

  \opening{Dear Mrs Canary}

  This is an imaginary letter.

  This is the second paragraph of the letter.

  \closing{Yours sincerely}

  \ps PS: this is a postscript.

  \encl{Photocopy of something interesting\\
   Photocopy of something rather dull}

  \cc{Prof Important Person\\Dr Bor Ing}
\end{letter}

\end{document}