Is your email list safe to send?
Paste or upload a list and see the problems that cause bounces: dead domains, throwaway addresses, typos and duplicates. Free, no sign-up, and no email is sent.
Up to 5,000 addresses. Nothing is stored, and no email is sent. 3 free reports a day.
Finds dead domains
Domains that don't exist or can't receive email will bounce every time.
Spots throwaways and typos
Temporary inboxes and gmial.com-style typos, with a suggested fix.
Never contacts a mailbox
Checks formats and domains only, so it's instant and private.
List health questions
What does the list health check look at?
Address format, duplicates, likely typos (like gmial.com), throwaway email domains, domains that don't exist or can't receive email, shared inboxes like info@, and domains we've previously seen accept every address.
Does it tell me which addresses are valid?
No. This free report never contacts a mailbox, so it can't confirm an address exists. It finds the problems you can spot without sending anything. To verify every mailbox, sign up free and get 300 checks a month.
Is my list stored or shared?
No. Only the email addresses are sent for the check, your other columns stay in your browser, and nothing is saved. We only keep counts in our logs.
How many addresses can I check?
Up to 5,000 addresses per report, and 3 free reports a day. Signed-in users aren't limited to 3 a day.
What is a good bounce rate?
Keep hard bounces under 2%. Above that, mailbox providers start to treat your mail as spam, and your email tool may warn you or pause your account.
What should I do with shared inboxes like info@?
They often work, but replies are lower and some are monitored by a team that marks cold email as spam. Check them before you include them in cold outreach.
Planning a campaign? Work out how many sending domains you need with the cold email domain calculator.