\fancypagestyle{firstpage}{ % note opening bracket
\fancyhf{} %<<<<----- clear all fields
\fancyhead[L]{\includegraphics[width=.2\columnwidth]{logo}\quad \hrulefill}
\fancyfoot[c]{
\begin{tabular}{|c |c |c}
\tiny \textbf{sede Legale} &
\tiny \textbf{sede operativa}&
\tiny tel. 0xxxxx\\
%----------------fine prima riga---------------------
\tiny Via xxxxxxxx & \tiny yyyyyyyy & \tiny fax zzzzzzzz \\
%----------------fine seconda riga --------------------
\tiny xyzxyzxyz)&\tiny xyzxyzxyzxyz&\includegraphics[width=.1\columnwidth]{zzzzzzzzzz}\\
%----------------fine terza riga----------------------
\tiny http://www.xxxx.it&\tiny yyyyy@xxx.it&\includegraphics[width=.1\columnwidth]{zzzzzz}\\
%—————fine quarta riga———————-
\end{tabular}}
}
ho usato \tiny per ridurre la dim. tel testo, ma l’interlinea rimane grande, come se il carattere fosse grande.