acmart: ugly email addresses -- how to avoid line breaking?

Question

acmart is creating very ugly line breaks in some of my colleagues' email addresses, and I don't know how to fix this since things like \small (to reduce font size) and \hbox (to avoid line breaking) don't work here. Is there a way I can convince LaTeX to avoid breaking the email addresses?

Here's an example of the code:

\documentclass[sigconf]{acmart}

\begin{document}

\title{Paper Title}

\author{Author 1}
\email{email@domain.com}
\affiliation{Affiliation}

\author{Author 2}
\email{email@domain.com}
\affiliation{Affiliation}

\author{Author 3}
\email{email@domain.com}
\affiliation{Affiliation}

\author{Author With Long Email 1}
\email{long\_long\_long\_address@domain.com}
\affiliation{Affiliation}

\author{Author With Long Email 2}
\email{long\_long\_long\_address@domain.com}
\affiliation{Affiliation}

\maketitle

\end{document}

And here's the result:

Answer 1

You can make all emails smaller by redefining \UrlFont. You can avoid the break by redefining \UrlBreakPenalty:

\documentclass[sigconf]{acmart}

\begin{document}

\title{Paper Title}

\author{Author 1}
\email{email@domain.com}
\affiliation{Affiliation}

\author{Author 2}
\email{email@domain.com}
\affiliation{Affiliation}

\author{Author 3}
\email{email@domain.com}
\affiliation{Affiliation}

\author{Author With Long Email 1}
\email{long\_long\_long\_address@domain.com}
\affiliation{Affiliation}

\author{Author With Long Email 2}
\email{long\_long\_long\_address@domain.com}
\affiliation{Affiliation}

\begingroup
 %\def\UrlFont{\ttfamily\scriptsize} %smaller email
\mathchardef\UrlBreakPenalty=10000
\maketitle

\endgroup
\end{document}