Question: Is there an email API that offers custom domains, batch unsubscribe links, and sandbox API requests for testing and logging emails?

If you're looking for an email API that offers custom domains, batch unsubscribe links and sandbox API requests, Waypoint is a good choice. It's geared for collaborative product teams, with a template builder that's powerful but not overwhelming, end-to-end observability and features like custom domains, batch and unsubscribe links, and sandbox API requests. It also comes with real human support and tiered pricing plans, including a free plan for testing emails.

Another good choice is Courier. Although it's geared for building omnichannel notification systems, it can handle email and offers centralized analytics and logging, customizable UI components and advanced user preferences. Courier is good for companies trying to modernize their notifications without a lot of programming work, with pricing from a free plan to custom enterprise deals.

If you prefer an AI-infused approach, Mailmodo could be the ticket. The company is focused on conversion and maximizing email return on investment with personalized and interactive customer interactions. It's got features like interactive carts, automated custom experiences and a drag-and-drop visual workflow builder, so it's good for companies that want to take their email marketing to the next level. A 21-day free trial is available to get you started.

If ease of use is a top priority, MailerLite is worth a look. It's got a drag-and-drop editor, automation and transactional emails, along with detailed analytics and integration abilities. It's designed to be easy to use even if you don't know how to program, and it's got a free plan with 12,000 monthly emails and 24/7 customer support.