Fastmail is a privacy-respecting email, calendar, and contacts service used by professionals, founders, and privacy-conscious individuals who want a Google Workspace alternative with strong spam filtering, custom domains, and no ads or data mining. Marketed as a privacy-first email and calendar service, Fastmail combines IMAP and JMAP-compatible email accounts, integrated calendar and contacts with CalDAV and CardDAV, custom domain hosting, masked email addresses for signups, advanced spam filtering, two-factor authentication, integrated 1Password support, and standards-based open protocols. Fastmail is a strong fit for solopreneurs running their business email under a custom domain, privacy-minded households consolidating family email, and founders avoiding the data-mining model of free email providers.