ESP finder Reviews — Discover what people think of this product.

It is sometimes important to know which Email service provider (ESP) is behind an email address: It can be a quick way to filter out free email addresses from your database to focus only on B2B contacts. Sending emails from Gmail to Gmail and Outlook to Outlook is boosting your email deliverability. For even better results, you can use an ESP warmup tool. You can optimize the copy of your email to align with how each ESP displays emails.