JSFiddle - React, Tailwind, and code Playground

HTML

<a href="mailto:me@example.spam" id="lnkMail">moc.elpmaxe@em</a>

CSS

#lnkMail {
	unicode-bidi: bidi-override;
	direction: rtl;
}

JavaScript

$('#lnkMail').hover(function(){
	// here you can use whatever replace you want
	var newHref = $(this).attr('href').replace('spam', 'com');
	$(this).attr('href', newHref);
});