Emailable

Emailable focuses on email verification with a three-part offering. You get a bulk list-cleaning tool for tackling thousands of addresses at once, a real-time API for validating emails as they arrive, and a free deliverability test to check your sender reputation. This mix appeals to marketers wanting both scale and immediate validation.

The free test report is a good entry point if you're unsure about your list quality. Paid plans handle heavier volumes and tighter integration.