SecureThread puts your team's email in one place, on the Google Workspace, Microsoft 365 or SMTP mailboxes you already use. Write in simple, visual or HTML editors with templates and live desktop and phone previews. Answer mail from every connected mailbox in a shared inbox with assignment and notes. Run campaigns and scheduled sends with one-click unsubscribe. Draft with AI, and let AI agents send over MCP or the API under their own rules. Risky emails wait for a person to approve them, from the app, Slack, Teams or a phone, and every send is logged. Runs on the web, Android and Windows.