This is a standout feature. Many corporate servers are set to "catch-all," meaning they accept all incoming emails regardless of whether the specific address exists. Semrush flags these as "Risky" or "Catch-all," saving you from potential bounces or spam traps that other free checkers might miss.

Log in to your Semrush account and navigate to the "App Center" in the sidebar.

Semrush offers a surprisingly robust, genuinely free email verification tool that is perfect for small businesses, one-time list cleanups, and casual users. While it lacks the bulk processing automation of paid enterprise solutions, it provides essential validation data without the "freemium" bait-and-switch often found elsewhere.

Semrush operates this tool on a freemium model, but the free offering is generous:

Semrush doesn’t just say "Yes" or "No." It provides specific status codes that help you understand why an email is valid or invalid: