If you are using yahoo email, then you can WhiteList your email by this following ways.

Yahoo! Mail

If you have not received an email from LinkWorld.us

Check your Spam Folder. If you see an email from Link World:

1. – Please open the email.
2. – Next click the Not Spam button on the top toolbar.
3. To ensure delivery: Create a filter to automatically send email from Support to your Inbox.
4. – Move your mouse over or tap the Gear icon in the top right navigation bar.
5. – Select Settings from the list that drops down.
6. – Choose Filters located on the left side of the page.
7. – Click the Add button on the Filters page.
8. – Create a name such as Whitelist in the Filter name field.
9. – In the From field leave the default contains selected.
10. – Enter our email address no-reply@linkworld.us in the text box next to Contains…
11. – Choose the destination folder to which you would like the message delivered. For example: Inbox.
12. – Click or tap Save…
13. – You will see in the next screen -Deliver to Inbox if From contains Support-
14. – Click or tap Save on this screen.
15. – You will be returned to your Yahoo! Inbox.

Thanks