Runs in your browser
Hard Bounce Rate Calculator
Measure permanent failures on their own.
How it works
Hard Bounce Rate Calculator
Measure permanent failures on their own. The check runs in your browser. MailShrine Email Sanitization flags invalid syntax, disposable and role-based addresses, and duplicates. It does not probe mailboxes, and it does not send the campaign.
Results appear here after you click Calculate.
The full pass — syntax, disposable and role flags, duplicates — is Email Sanitization. You start with 200 credits per month. The send, later, is Email Marketing.