\documentclass[10pt]{article}
\usepackage{authblk}
\renewcommand\Affilfont{\itshape\small}
\begin{document}
\title{Author Affiliations in \LaTeX}
\author[,1]{Arthur A. Filliation\footnote{aaf@mail.com}}
\author[,2]{Arthur A. Filliation Jr.\footnote{aaf2@mail.com}}
\author[1]{Con T. Ributor}
\affil[1]{Department of Latex Studies.}
\affil[2]{Typesetters of America}
\date{\today}
\maketitle
......
\end{document}