\documentclass[DM,authoryear]{lsstdoc}% Package imports go here% Local commands go here\title[Short title]{Title of memo}\author{
A.~Author,
}\setDocRef{DMTN-nnn}\date{\today}\begin{document}% Create the memo title page\setMemoto{S. Person}\mkmemotitle
To whom it may concern,
this is an important topic we wish to bring to your attention.
Now write your document as you would normally write it.
\restoregeometry\newpage
This is how page 2 looks
\end{document}