Answer found in Related Conversations. Thanks!
Go to _ Tools>Settings>Privacy>unsafe content _ and click on _ “show whitelist” _. In the whitelist you can delete the sender that bothers you.
Tools->Settings->Mail->Privacy> Show Whitelist
Thanks for this. I just had a issue with a trusted sender starting to include adds with their mail after I had safely allowed it to download attachments and I have been all over settings trying to find this.