Suggest recommended by the community Let me know which area you'd like to explore further. How do I control spam and other junk mail?

For more information, you can find detailed documentation on HCL Product Documentation and HCL Notes and Domino Wiki . If you'd like, I can:

Administrators can create server-side mail rules to block malicious domains or keywords within the body or header of messages.

Show you in the configuration document Provide a step-by-step for creating QuickRules for users

Anti-spam strategies for Lotus Notes (now HCL Notes/Domino) in 2026 involve a combination of built-in server-level controls and user-level client tools to manage junk email and phishing attacks. Modern approaches focus on using SMTP-inbound edge servers, SPF/DKIM validation, and third-party tools to handle sophisticated spam, as native filtering alone is generally considered insufficient for modern threats. 1. Server-Level Anti-Spam Measures (Domino Administration)

Configure DNS Blacklists (DNSBL) to drop connections from known spam hosts before they enter the network.

Users can create instant rules based on the sender, domain, or subject line to move future messages automatically to the Junk folder.