Molto semplicemente criptandolo
codice:
<a href="&#109&#97&#105&#108&#116&#111&#58&#109&#105&#111&#105&#110&#100&#105&#114&#105&#122&#122&#111&#64&#110&#111&#109&#101&#115&#105&#116&#111&#46&#99&#111&#109&#46&#99&#111&#109&#63&#115&#117&#98&#106&#101&#99&#116&#61&#105&#110&#102&#111">&#87&#101&#98&#109&#97&#115&#116&#101&#114</a>