Question: I'm looking for a reliable email API that can handle high-volume transactional emails and complies with data protection regulations.

For a trusted email API that can handle high-volume transactional emails and meet data protection requirements, Retarus is a good option. The cloud-based communication platform offers a secure and reliable Email API for transactional emails, as well as Fax Infrastructure and Intelligent Document Processing. It's geared for businesses that need to comply with regulations like GDPR, HIPAA and ISO 27001, and it's scalable and reliable with seven data centers and more than 2,800 servers.

Another good option is Twilio, a customer engagement platform that includes communication APIs for SMS, WhatsApp, voice and email. Its powerful Email API lets you send transactional and marketing emails at large scale, and Twilio is designed to help businesses personalize customer journeys and onboard users securely. It's got strong authentication and identity options, so it's a good choice for high-volume email needs while also meeting data protection requirements.

Mailjet also offers a full-featured Email API for both marketing and developer teams. Its user-friendly interface is popular, and Mailjet offers features like dynamic sections, segmentation and automation, along with advanced deliverability and real-time tracking. It's designed to ensure reliable and high-volume email delivery with its powerful API integration and compliance with industry standards.

If you want a single API platform, check out Nylas. It connects email, calendar and contacts services so you can build a unified user experience. Nylas has a reliable Email API with features like easy integration, guaranteed uptime and compliance with regulations like GDPR, CCPA and HIPAA. It supports several programming languages and offers a lot of developer tools, too, so it's a good option for large-scale and secure email operations.