Yes, it can be included in the \author{} tag. Like so:
\author{User1 \\ [email protected] \and User2 \\ [email protected]}
However, note that this is not the canonical way to do it. Usually the second line in the author tag is for the author's address and affiliation which may include the email address. Sometimes, the email address is rather put into a footnote (e.g. with the \thanks{} tag inside the \author{} tag). But it can be (and is occasionally) done like this, only putting the email address without affiliation under the authors names. You might want to have the email address in monospace font which can be done by also applying the \texttt{} tag like so.
\author{User1 \\ \texttt{[email protected]} \and User2 \\ \texttt{[email protected]}}