How to block someone from e-mailing you?

How do you block someone from emailing you?

• This isn't regarding trolls or anything, but say there is someone who keeps contacting you via email and the emails are of either a threatening or non-sensical nature, and you can't block them like on Deviantart or report them. Is there a way to block unwanted users or prevent them from emailing you so you won't have to put up with them again?

• Answer:

  Yes, certainly! 1. Click Options in the upper-right corner of your Yahoo! Mail page. 2. From the list on the left, click Spam. 3. In the middle of this page, in the space provided in the "Blocked Addresses" section, enter the email address from which you don't want to receive mail. 4. Click Add. 5. Click "save changes" at the top of the page. 6. The address now appears on your list of blocked addresses. You may block up to 500 email addresses. You can see how many of your blocked addresses you're using beside the list - for example, 4 of 500 used.