% Cover letter using 4letter.cls
\documentclass[letterpaper]{letter}
% the following commands control the margins:
\topmargin=-1in    % Make letterhead start about 1 inch from top of page
\textheight=9in    % text height can be bigger for a longer letter
\oddsidemargin=0pt % leftmargin is 1 inch
\textwidth=6.5in   % textwidth of 6.5in leaves 1 inch for right margin

\usepackage{hyperref}

\begin{document}
  \pdfpageheight 11in
  \pdfpagewidth 8.5in

\signature{Davis Remmel}                  % name for signature 
\longindentation=0pt                     % needed to get closing flush left
\let\raggedleft\raggedright              % needed to get date flush left
 
\begin{letter}{Client Organization, Inc. \\
510 Somewhere Blvd \\
Milwaukee, WI 53000} 

\begin{center}
{\large\bf Davis Remmel} \\
{PO Box 42069 \\ Milwaukee, WI 53000  \\ 1-414-975-1234; \href{mailto:d@visr.me}{d@visr.me} \\ \href{http://www.davisr.me/}{http://www.davisr.me/}} 
\end{center} \vspace{1cm} \vfill % forces letterhead to top of page

\opening{Greetings,}

This invoice is a notice of services rendered. Please mail a check for the total amount due, payable to the name and address in the letterhead, within 30 days.

{\addtolength{\leftskip}{24pt}

%iitems%

{{\vspace{12pt}\it Total Due\dotfill \$%itotal%}}

}

\closing{Thank you,}

\begin{flushright}
\vspace{-22pt}
\hfill ID: %iid%
\end{flushright}

\vfill
\vspace{1cm} % offset from header space

\end{letter}
 

\end{document}