How to implement unsubscribe feature for website?

Question

Hai,
This is my task
Example:when we upload our resume to naukri.com we get mails some companys regarding job openings
so at the bottom we see a link if you want to unscribe please click the link button

so actually this is my task when customer doesnt want to receive mails from our product if he wants to unscribe when he clicks the link button he has to unsubscribe from our website

plz help me what logic i have to write which services i have to use plz help me

Thanks,
Karthik