letter.tex

\documentclass{SFLetter}

\name{Firstname Surname}
\date{32nd Never 2063}
\subject{Re: This is of the utmost importance}
\greeting{Dear Sir/Madam,}
\signoff{Yours faithfully,}
\address{Housington House\\123 Placey Road\\Townton\\Towntonshire\\TO12 3WN}
\email{firstname.surname@organisation.co.uk}
\signaturefile{signature.png}

\begin{document}

\maketitle

Blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah.

Blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah.

\makeclosing

\end{document}