TYPO3 Core

Currently, if someone right clicks and copies a spam protected email address, they get javascript:linkTo_UnCryptMailto('sdfgserwhatevereteggh');
For email where the link text is not the address, I could see those who don't use an email client being unsure of how to get the address.

What I've experimented with is triggering a function on opening the context menu, to replace the href contents with the correct email.

Example here: https://jsfiddle.net/nhaskins/1nk7ky75/2/

I've tested this in TYPO3 by adding the following function to typo3/sysext/frontend/Classes/Page/PageGenerator.php at line 756 (end of $scriptJsCode)

function UnCryptMailto(el) {
    var str = el.getAttribute("href").split("\'")[1];
    el.setAttribute("href", decryptString(str,' . $tsfe->spamProtectEmailAddresses * -1 . '));
    el.removeAttribute("oncontextmenu");
}

and the following in typo3/sysext/frontend/Classes/ContentObject/ContentObjectRenderer.php at line 5646 (just before $tagAttributes = [];)

if ($tsfe->spamProtectEmailAddresses) {
    $finalTagParts['aTagParams'] .= ' oncontextmenu="UnCryptMailto(this)"';
}

I'm pretty sure this isn't the best way to include the oncontextmenu attribute, and it looks like it would need to be added to at least the f:link.email viewhelper as well.