\documentclass{oxmathletter} % if using pdflatex
%\documentclass[xelatex]{oxmathletter} % if using xelatex 

\signature{Frank R. Action} % your name as you want it to appear as signature

% This document class should only be used for official departmental business
% As such the option defaults are the official departmental general contact
% details. Defaults should only be overridden with your personal official 
% departmental contact details

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%optional commands to override defaults
%do not include these commands if you wish to stick with the defaults
\position{Head of Sums} % your role/position, default none shown

\phone{251364}   % your direct phone number (area code is added automatically)
                  % default none shown

\fax{270515}     % fax number (area code is added automatically)
                  % defaults to St Giles reception fax

\econtact{frank.action}  % your official (long format) maths e-mail address 
                         % without @maths.ox.ac.uk 
                         % this will produce your official email address
                         % and the URL of your official web profile page

\refcode{MIIT/2010/17A} % optional reference code to specify on letter
                         % default none shown

%end of optional commands
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\begin{document}

\begin{letter}{
Prof. Earnest P. Silon \\  
Dept of Mathematics\\
University of Netherfield\\
NF1 2QT}

\subject{Departmental \LaTeX{} Letter Class similar to Word Version}  
% optional subject line

\opening{Dear Earnest,}  % initial greeting/opening

This is a new letter class based on the standard \LaTeX{} letter class.

The university has specifically chosen a commercial font, Foundry Sterling
Book, for the header and footer text on official documents. The original font
is a truetype font and has been specifically installed on the departmental
Linux systems for use with this new class.

Note the font works with PDF\LaTeX{} (or Xe\LaTeX) but not ordinary \LaTeX!

This example tex file contains comments explaining the options/commands.

\closing{Yours sincerely} % closing phrase
\end{letter}
\end{document}