How to stop search engine from crawling these links?

if i don't want yahoo Crawl these links,how can i do?

<a href="https://mailtemp.net/checklogin">
<a  href="https://10-minutemail.com/userlogin">

https://10-minutemail.com

https://10-minutemail.net

https://mailtemp.net

How to stop yahoo from crawling these links?