Would it be possible to somehow catch attempts to click a mailto link and pop up a more descriptive explanation than the browser error message?
I don't know that you can determine whether a browser supports mailto: links. But as for attaching logic to mailto links, you could cycle through the links on the page, and test their href
value. If it begins with "mailto:" you could attach a popup upon clicking it.
var maillinks = document.getElementsByTagName("a");
var (var i = 0; i < maillinks.length; i++) {
var currentlink = maillinks[i];
if (currentlink.href.substring(0,7) === "mailto:") {
alert("Sorry. These aren't allowed.");
return false;
}
}
The only real solution I can think to this problem is to host your own contact page, providing a small form that the user can submit.