The following shortcode snippet is useful for disguising emails to protect them from SPAM. Please note that this method only works if Javascript is activated. Furthermore, there is no 1001TP4-proof protection against bots that collect email addresses from websites.

add_shortcode( mnc_mail', function ( $atts ) {

	$atts = shortcode_atts( [ 'email' => '' ], $atts, mnc_mail' );

	$calc_mail = function ( $text ) {
		$encoded_text = '';
		$length = mb_strlen($text, UTF-8');
		for ($i = 0; $i < $length; $i++) {
			$char = mb_substr($text, $i, 1, UTF-8');
			$encoded_text .= '\\u' . sprintf("x", ord($char));
		}
		return $encoded_text;
	};
	$obfuscate = $calc_mail($atts['email']);

	return <<< FORMAT
<a href="javascript:location='mailto:$obfuscate';void 0"><script type="text/javascript">document.write($obfuscate')
FORMAT;
} );Code language: PHP (php)