=== Example for Mailto #1 ===
<context source=yes>
\setupinteraction[state=start]
\useurl [mymail] [mailto:nobody@example.zzz] [][visible@mailaddress.zzz]
\starttext
Send your spam to \from[mymail]! \stoptext
</context>
<context source=yes>
\setupinteraction[state=start] \starttext Send your spam to \goto{visible@mailaddress.zzz}[url(mailto:nobody@example.zzz)] \stoptext
</context>