If I receive an email in any email client be it Outlook, GMail, etc and the email contains a link to a website, is it possible to perform a POST request to the website as opposed to a GET request?
For information retrieval, including links made with
<a href>, only GET can be used.
If you want POST for whatever reason, you'll have to create a
<form method="post"> with a submit button. (And think carefully about whether you need it; it's an ugly way to track users, and it's uncacheable.)