Support

Help & FAQ

Common questions about getting started, billing, GDPR, and the API. Can't find what you need? Email our support team.

How do I get an API key?

Sign up for a free account at mailverify.co.uk/register. Once logged in, go to the Dashboard → API Keys and create your first key. Keys are shown once — save it somewhere safe.

What does a verification result mean?

The result field returns one of:

valid — mailbox exists and accepted our probe.
invalid — mailbox rejected or domain has no MX records.
catch_all — domain accepts everything; deliverability unknown.
disposable — known temporary/throwaway domain.
role — role-based address (info@, support@, etc.).
unknown — server gave an ambiguous response (greylisting, etc.). Re-checked automatically on next request.

Is my data stored on UK servers?

Verification runs on infrastructure in the United Kingdom, and outbound SMTP checks to recipients' mail servers use UK IP addresses. We don't keep verified addresses or results after your response is returned. Account data for your login is processed on UK-based systems. See our Security page for details.

Do you store the email addresses I verify?

No. We never cache or persist verification results. Addresses are checked in memory; the only temporary hold is a short-lived entry in our Redis job queue so we can return your result, and that queue entry is cleared once the result has been delivered to you. We do not build or sell lists of verified addresses.

Do I need a Data Processing Agreement (DPA)?

If you're verifying addresses belonging to EU/UK data subjects as part of a commercial process, you should have a DPA in place. Email [email protected] to request one — we'll turn it around quickly.

What's the difference between single and bulk verification?

POST /v1/verify handles one address at a time and returns a result within seconds. POST /v1/verify/bulk accepts up to 10,000 addresses in one request and processes them asynchronously. Results are delivered via webhook or polled using the batch results endpoint.

What happens when I hit a rate limit?

You'll receive a 429 response with a Retry-After header. Throughput limits are 1 request per second on Free/Starter, 60 per minute on Pay-as-you-go and Subscription. Enterprise (including RapidAPI with your own account) has no API throughput cap; bulk submission limits still apply. See the rate limits docs.

Can I use MailVerify for free?

Yes. The Starter plan includes 25 verification credits per month at no cost, with dashboard access and API access (one API key). For more volume, Scale is £49/month (50,000 verifications/month) and Unlimited is £99/month. You can upgrade at any time from the dashboard.

Do credits roll over month to month?

No. Monthly allowances reset on the 1st of each month. Unused verifications do not carry over. If you need more flexibility, contact us about an Enterprise plan.

How do I cancel my subscription?

Go to Dashboard → Billing and cancel at any time. Your plan stays active until the end of the current billing period. For questions email [email protected].

My API key isn't working — what should I check?

Ensure you're passing it as a Bearer token: Authorization: Bearer mv_live_…
Check you haven't accidentally included extra whitespace or line breaks.
Confirm the key hasn't been revoked in the dashboard.
Check your account has remaining credits for the current period.
Still stuck? Email [email protected].