Select a message from a sender you wish to block: Right-click on the sender's address and choose Create Filter From....

   block sender

   This will open the Filter rules window with the email address already inserted into the filter.
       Name the filter. Something like "Block list" would be appropriate.
       In the bottom half of the window, change the action to perform to Delete Message.

       filter rule

   Click OK to save the filter. The next time that person sends you mail, it will automatically be deleted. 

So, there was no option to "Create Filter From" when I right clicked on the sender's address as your FAQ suggested. So, I couldn't proceed to have the spam automatically deleted from my Thunderbird accounts. I COULDN'T do the following: Select a message from a sender you wish to block: Right-click on the sender's address and choose Create Filter From.... block sender This will open the Filter rules window with the email address already inserted into the filter. Name the filter. Something like "Block list" would be appropriate. In the bottom half of the window, change the action to perform to Delete Message. filter rule Click OK to save the filter. The next time that person sends you mail, it will automatically be deleted. The Message filter that you have created can be opened and edited by selecting the Message filters... entry in the Tools menu. It is not necessary to create an individual filter for each address you want to block. Now you have the Block list filter, the next time you want to block someone you can add the person's address into the top of the filter by clicking the + button and thus creating a new field to enter the new address. Make sure you select the "Match any of the following" option, as you wish it to fire on any of the listed addresses.