This requires loading an external SVG file, better use an inline version:

    <object data="data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20200%2024%22%3E%3Ca%20href%3D%22mailto%3Amyemail%40mydomain.tld%22%3E%3Ctext%20x%3D%2250%25%22%20y%3D%2250%25%22%20dominant-baseline%3D%22middle%22%20text-anchor%3D%22middle%22%3Emyemail%40mydomain.tld%3C%2Ftext%3E%3C%2Fa%3E%3C%2Fsvg%3E" type="image/svg+xml"></object>

Also have a look at this: https://spencermortensen.com/articles/email-obfuscation/