I'm having a problem with acm_proc_article-sp author's long email address, they overlap each other.
Please suggest a solution for this.

I'm having a problem with acm_proc_article-sp author's long email address, they overlap each other.
Please suggest a solution for this.

The workaround I use is to declare only 2 authors instead of 4, i.e., \numberofauthors{2} and then
\author{
\alignauthor AAA\\
...
\alignauthor BBB\\
...
\and
\alignauthor CCC\\
...
\alignauthor DDD\\
...
}