Software as a service (SaaS) services featuring software for creating, managing, and recovering electronic mail accounts and message inboxes for software agents, automated workflows, and developer teams; providing online non-downloadable software for receiving, searching, organizing, and replying to electronic mail; providing online non-downloadable software for extracting verification codes, verification links, receipts, billing notices, support messages, and workflow events from electronic mail; user authentication services using blockchain-based wallet signatures for online software applications.