Your email provider sees everything. Most are ad-supported and scan your inbox. These don't. Vetted for privacy, reliability, and usability.
Fastmail is the email provider we actually use and recommend without hesitation. Australian-based, no ad scanning, JMAP protocol (faster than IMAP), excellent custom domain support, and a mobile app that doesn't make you want to throw your phone. The pricing is transparent — no freemium data-for-service model.
Gmail (free) and Yahoo Mail scan your email for ad targeting. Outlook.com (free) does the same. If you're running a business, using these for client communications is a reputational and privacy risk. Google Workspace is acceptable for larger orgs with proper admin controls — but for a 1-10 person team, Fastmail is cheaper and better.