Go naar het Customers & Suppliers menu

Click on the Suppliers tab. When the suppliers list has been loaded, you will see the Supplier Blacklist button appear at the top left.

If you go the the blacklist, you can add suppliers by the Add suppliers button:

When you added the supplier, you block all the documents he'll send to you. To add a supplier to the list, you need his or her email address. The date your supplier was added to the list and the number of blocked documents is shown in the list.

If you want to remove a supplier from the blacklist, click on Delete next to the line.

Another way to add a supplier to the blacklist is to decline an invoice that you received from that supplier by email.