If you are sure the message you receive from someone is junk email, you can block the sender's messages following steps below:
Step 1: Right click on the email you received and you think that is the junk email;
Step 2: In the dialog box, click "Junk" at the bottom;
Step 3: From the list, select "Block Sender";
Step 4: A new message will appear, click "OK" to add the sender to the blocked list;
"The sender of the selected message has been added to your Blocked Senders list, and the message has been moved to the Junk E-mail folder."
Step 5: To check your blocked senders, please click "Junk E-mail Options" from step 3:
Step 6: In the new window, click "Blocked Senders", and you will see the list of emails you blocked.
– You can also add the junk emails by click Add.