bootstrap 4 email link code example
Example 1: how to link to an email in html
<a href = "mailto: [email protected]">Send Email</a>
Example 2: address tag in html
<address>
<a href="mailto:[email protected]">[email protected]</a><br>
<a href="tel:+1234567890">(123) 456-7890</a>
</address>