How do I block a particular sender's email address?

The option to block a specific sender address is found in the Mail app under the "Block addresses" link. You can also manage a list of blocked addresses in this application. Just enter an address from the app that you no longer want to receive emails from and click "Add."

1 Block addresses settings.

You can also block the sender directly in an open email.

1 Block addresses directly in a open email.

After saving the blocked address, incoming letters from this address will be sorted into the Spam + Virus folder, where they will be automatically deleted after one month. Users who have their mail forwarded to another address cannot use this feature because the forwarded mail is not checked for spam or blocking.

The blocking works only to a specific, precisely entered address, which is located in the From header of the received letter. The person can therefore continue to send you letters from another (similar) email address.

This feature is not primarily designed to handle incoming spam. Mark spam using the "Report as unrecognized SPAM" option.