Block email addresses
1. Open an email or select it from your mailbox.
2. Click the More icon 
.
2. Click Block Senders.
2. Optionally, select to also delete emails you've received from the sender.
3. Click Ok.
Unblock email addresses
1. Click the Settings icon 
| click More Settings .
2. Click Security and Privacy.
3. Mouse over an email address, then click the Delete icon 
.