Users can select junk emails and click More > Deliver Sender's Mail to Junk to manage unwanted mail and train the system.
Administrators can create server-side mail rules to block malicious domains or keywords within the body or header of messages. anti spam lotus notes
Enable SPF (Sender Policy Framework) and DKIM (DomainKeys Identified Mail) on Domino 12+ servers to identify and move untrusted mail to users' Junk folders. Users can select junk emails and click More