What package or class defines an \email macro?

Question

A colleague sent to me a manuscript written in Ubuntu. I am using Mac OS X Snow Leopard and I only have trouble when I compile the document due to the latex command \email. It seems it is not recognised. What package should I install or what else should I do?

Answer 1

I know that \email is defined in lettre.cls the french version of letter.cls but this macro is perhaps defined in another class or package

Answer 2

The AMS document classes (amsart and amsbook) define the \email command.

Answer 3

Extrapolating from your last question, the llncs class has a email macro. In the preamble, use it like this:

\documentclass{llncs}
...
\author{First Author}
\institute{
  Example Institute,
  Example Road 12,
  \email{author@example.com}
}
\begin{document}...

Actually, all the macro does is to set the email address in a typewriter font.