InboxCheck - Catch Bad Emails Before You Send

Instantly verify email addresses on any webpage. Know if an email is safe, risky, or invalid before you hit send.

Protect your sender reputation and stop your emails from landing in spam. Verify leads instantly without ever leaving your workflow. Every bounced email damages your domain reputation. Send too many, and algorithms will route your carefully crafted outreach straight to the spam folder. Traditional email verification is slow. You have to export CSV files, upload them to a dashboard, wait for results, and then cross-reference back to your leads. InboxCheck eliminates this friction entirely. We built InboxCheck for outreach professionals, founders, recruiters, and growth marketers who want to build highly targeted lists without sacrificing hours to data hygiene. What InboxCheck Does InboxCheck runs seamlessly in your browser and automatically detects email addresses on the pages you visit. With a single click, it runs a real-time verification sequence directly over the email address, displaying a clean visual badge that confirms if the address is safe to email. Why You Should Install InboxCheck • Prospect with Absolute Confidence Never guess if a lead's email is active. Immediately know if an address is Valid, Invalid, Catch-All, or Disposable before you ever hit send. • Zero Context Switching Keep your focus where it matters. Whether you are browsing a CRM, scanning a directory, or reading a company page, InboxCheck lives exactly where you work. • Eliminate the CSV Export Bottleneck Stop breaking your flow to verify a single high-value prospect. With subtle hover badges, you can qualify leads one by one exactly at the moment of discovery. • Safeguard Your Deliverability Make sure your outreach actually reaches the primary inbox. By catching typos, honeypots, and deactivated accounts proactively, you keep your bounce rate near zero and your domain health perfect. • Privacy-First Architecture We respect your operational security. InboxCheck only scans the emails you explicitly choose to interact with. Your browsing history and workflow data remain completely private. Try it completely free today. Start with 100 verifications on the house, and receive 5 additional free verifications every single day for life. No credit card required. Install InboxCheck and start prospecting smarter, faster, and safer.