Email verification
Email verification for SaaS products
Stop fake and mistyped sign-ups before they become accounts.
What usually goes wrong
Trial abuse with disposable addresses, one person creating many free accounts.
Activation and password-reset mails that bounce, which also hurts the reputation of your transactional sender.
Dashboards that count bot and typo sign-ups as real users.
An example
A product team adds a check to its sign-up form. Disposable and invalid addresses are refused with a clear message, and the activation rate is measured again on the remaining sign-ups.
How to do it with Mailcut
- Call the verify API from your sign-up handler before you create the account.
- Refuse invalid and disposable results with a clear message; let risky addresses through but flag them.
- Keep your activation mail on a separate sender stream from marketing mail.
- Verify the existing user table once with the bulk verifier and look at how many are invalid before you plan a win-back campaign.
Frequently asked questions
Will blocking disposable addresses lose real users?
Some privacy-minded people use them. Show a message that explains why and offers another address; most legitimate users have one.
Is the API fast enough for a sign-up form?
It checks the mailbox itself, so the answer is not instant. Run it when the field loses focus or in the background, and do not block the form on a slow answer.
What about addresses that come back risky?
Accept them, mark them in your database and watch for bounces on the first mail.
Start with free credits
Create an account, check your first addresses and see the report. No card needed.
Create free account