In the Perform these actions section, change the box to Delete Message.

For example, you could name it something like 'Blocked Addresses.'

In the Filter Rules window that appears, type a name for the filter.

On the next screen click on Block to block emails from this sender. Next, click the Block Sender option that you will find in the popup menu (See image below). Now, click on the Down Arrow at the top right corner of the email (See image below).

Right-click their address at the top of the message and select Create Filter From. Open the email from a sender that you want to block.

Open a message from the sender you want to block.

Mozilla Thunderbird Block a sender from a message

You should see that entry disappear from the list and a 'Blocked sender deleted' message in the top-middle section of the screen.

In the Security and privacy section, move your mouse pointer over the e-mail address you want to unblock and click the Delete blocked sender icon that appears on the right side.

Remove a blocked address from the settings menu

Type the sender's e-mail address and click Save.

In the window that appears to the right, click the link.

On the left side of the next screen, click the Security and privacy option.

In the drop-down menu that appears, near the bottom, select More Settings.

Click in the upper-right corner of the window.

You can block more than one sender at a time by checking the boxes next to multiple messages in a folder (e.g., your Inbox), and then follow the same steps listed above.

Once you're finished with your selections, click the button in the bottom-right corner of the window.

On the right side of the screen, click the delete icon next to each address you want to unblock.

In the next window, under Settings, select Mail and then Junk email.

Click View all Outlook settings at the bottom of the menu that appears.

Click the icon in the upper-right corner of the window.

Remove blocked addresses from the settings menu

Right-click the message and select Stop ignoring from the third section of the drop-down menu.

Locate the sender's message in the Deleted Items folder.

Remove blocked addresses using an existing message

In the prompt that appears, click the OK button.

In the drop-down menu that appears, in the third section, select Block.

Right-click a message from the sender you want to block.

Remove blocked addresses from the settings menu.

Remove blocked addresses using an existing message.

How to block emails in gmail account