MailSure

Terms of service

Last updated 5 November 2026

These terms are the agreement between you and MailSure ("we", "us") for the MailSure email verification service. By creating an account or using the service you agree to them.

1. The service

MailSure checks email addresses and reports whether they appear to be deliverable. You can check single addresses, upload lists and use our API. Each check returns a status, a score and the reasons behind it. See the API documentation for the details.

2. Results are an assessment, not a guarantee

Email verification is based on public DNS records, lists of known disposable domains and, where available, the responses of the receiving mail server. Some mail servers do not reveal whether a mailbox exists, and the information we rely on can change at any time. We work to make results accurate but we do not guarantee that an address marked valid will receive mail, or that an address marked invalid or risky will not. You remain responsible for how you use the results.

3. Your account

4. Acceptable use

You agree not to:

We may suspend or limit access immediately if we reasonably believe these rules are being broken.

5. Your data

You keep all rights in the lists and files you upload. You give us permission to process them only to provide the service to you. You promise that you are entitled to upload them. How we handle personal information is described in our privacy policy.

6. Credits, free tier, plans and packs

7. Payment and cancellation

Payments are taken through PayPal. Subscriptions renew every month until you cancel. You can cancel at any time from the Billing page, and the cancellation takes effect at the end of the period you have already paid for. There are no contracts and no cancellation fees. If you switch plan, we start a new subscription and cancel the old one once the new one has been paid. If a payment keeps failing, PayPal may suspend the subscription and the plan ends.

Except where the law requires otherwise, or where we agree to it in writing, amounts already paid are not refunded and unused monthly allowances do not carry over. If the service fails to work as described because of a fault on our side, contact us and we will put it right or credit you fairly. Nothing in these terms limits any right you have under consumer protection or electronic transactions laws that cannot lawfully be excluded.

8. Availability and changes

We aim to keep the service available but we do not promise it will be uninterrupted or error free. We may update, change or discontinue features, and we will give reasonable notice of changes that significantly reduce what you have paid for.

9. Intellectual property

We own the service, its software and its lists, and give you a limited, non-exclusive, non-transferable right to use it under these terms. These terms do not transfer any of our intellectual property to you.

10. Our liability

To the extent the law allows: the service is provided "as is"; we are not liable for indirect or consequential loss, lost profit, lost data, damage to your sender reputation or loss that arises from your use of the results; and our total liability to you for any claim related to the service is limited to the amount you paid us in the 12 months before the event that gave rise to the claim. Nothing here limits liability that cannot be limited by law, such as for fraud or gross negligence.

11. Ending the agreement

You can stop using the service and delete your account at any time from the Account page, which also cancels any active subscription. We may suspend or end your access if you break these terms, if we are required to by law, or on reasonable notice if we stop providing the service. Sections that by their nature should survive (such as 5, 10 and 12) will do so.

12. General

13. Contact

Questions about these terms: support@mailsure.co.