Fastmail
Fastmail is a premium email hosting service that provides secure, private, and ad-free email accounts with a focus on user control and data privacy. It offers features like custom domains, calendar, contacts, and file storage, built on open standards such as IMAP, SMTP, and CalDAV. The service is known for its fast performance, reliability, and strong stance against data mining and advertising.
Developers should use Fastmail when they need a professional email solution that prioritizes privacy, security, and customization, such as for personal projects, small businesses, or as an alternative to free email services that monetize user data. It's particularly useful for those requiring custom domain integration, advanced filtering rules, or who value open standards for interoperability with other tools. Fastmail is also a good choice for developers concerned about data sovereignty and avoiding vendor lock-in.