How to block unwanted mails in Gmail

Suppose you are being stalked by a former lover or simply get emails via Gmail that cannot be thwarted via 'Reporting Spam' (the button with the exclamation mark - see image below). The question is therefore: how do you get your peace of mind back without reporting the sender to the police.

The answer is easy.

If you're viewing your mail on a computer:
1. Open the offending email
2. At the top right of the email, click the down arrow
3. Click Block [sender]
If you blocked someone by mistake, you can simply unblock them using the same steps.

If you're viewing your mail on an Android phone or tablet:
1. Open the offending email
2. On the top right of the message, touch the gray menu
3. Touch Block [sender]
If you blocked someone by mistake, you can simply unblock them using the same steps.