The UK-native email verification API.
Fast, GDPR-compliant, ICO registered, GB infrastructure only, plain JSON.
POST an address, get back result, mx_host, and smtp_code in one round trip.
CRM friendly
Works with the stacks sales teams already live in
Verified emails drop into HubSpot, Salesforce, Pipedrive, Zoho, Odoo, Zapier, n8n, or anything that speaks HTTP. Same JSON whether you paste in the browser or call the API from a workflow.
POST /v1/verify · Bearer auth · JSON body
curl -s https://api.mailverify.co.uk/v1/verify \
-H "Authorization: Bearer mv_live_xxxxxxxx" \
-H "Content-Type: application/json" \
-d '{"email":"[email protected]"}'ICO Registered
ZC112021
UK Data Processor
GB infrastructure only
GB Servers
All traffic stays in the UK
GDPR-native
Built for it, not bolted on
Workflow
POST → classify → act.
One POST, one answer. Send us an email address and get back a clear verdict: valid, invalid, catch-all, or disposable.
POST /v1/verify
Bearer token in the Authorization header, email address in the JSON body. No SDK, no queue, no client library.
We resolve and probe
MX lookup, SMTP probe, disposable blocklist check, catch-all detection. Synchronous, in one round trip.
Read result + flags
result is the verdict. is_catch_all, is_disposable, is_role, is_free_email, did_you_mean, mx_host, and smtp_code give you everything to decide what to do next.
Request Example
curl -X POST https://api.mailverify.co.uk/v1/verify \
-H "Authorization: Bearer mv_live_xxxxxxxx" \
-H "Content-Type: application/json" \
-d '{"email":"[email protected]"}'Response Example
{
"job_id": "3f2a1b4c-...",
"email": "[email protected]",
"result": "valid",
"is_catch_all": false,
"is_disposable": false,
"is_role": false,
"is_free_email": false,
"did_you_mean": null,
"mx_host": "aspmx.l.google.com",
"smtp_code": 250,
"checked_at": "2026-04-05T14:22:00.000Z",
"server_region": "GB"
}Use Cases
Built for every flow.
Whether you’re stopping typos at checkout or cleaning a massive legacy CRM list, we’ve got you covered.
Signup & auth flows
Call on form submit or server-side before account creation. Reject disposable inboxes, warn on risky ones, block undeliverable outright.
Disposable address blocked.
Checkout & transactional email
Validate the billing email at the point of sale. One undeliverable address = a missed receipt and a support ticket.
CRM ingestion & lead scoring
Run inbound leads through the API before they sync. Tag by status, filter catch-alls, keep your segments clean from day one.
Alex Smith
Bulk list hygiene
POST /v1/verify for one address at a time, or POST /v1/verify/bulk for thousands per request. Scale plans also get CSV upload in the dashboard.
contacts.csv
Try it live
Paste an address and see the real JSON response.
Type any email address and get an instant result. 3 free checks per day.
Response Fields
What comes back in the JSON.
Everything you need to make a routing decision, bundled into a single synchronous response.
View full documentation →resultvalid, invalid, catch_all, disposable, role, or unknown. Ready to branch on in your signup or CRM logic.
mx_hostThe highest-priority MX we resolved. Useful for routing decisions or spotting domains with no mail infrastructure.
is_catch_allTrue when the domain accepts mail for any local part. Warn users or lower trust scores without rejecting the address outright.
is_disposableMatched against a live blocklist of throwaway inbox providers. Block them at signup, or just log them. Up to you.
is_free_emailTrue for consumer providers like Gmail, Yahoo, Hotmail, iCloud, and 4,700+ others. Filter personal addresses from business-only signups in one check.
did_you_meanCatches common typos — gmal.com, hotmail.con, outlok.com — and returns the likely intended address. Show a prompt and save the lead.
smtp_codeThe SMTP RCPT TO response from our probe. Concrete signal alongside the rolled-up result.
GB egress, GDPR-nativeEvery request routes through UK infrastructure. We don't store your lists. ICO registered, DPA available on request.
Pricing
Simple pricing, no surprises.
Starter
Kick the tyres. Full API access on the free tier. No card, no commitment.
- 25 free verifications / month
- Dashboard access
- API access included
- Community support
Scale
Full API access and 50,000 verifications a month. Everything you need to ship to production.
- 50,000 verifications / month
- Up to 5 API keys
- Bulk CSV upload
- Webhooks
- Email support (UK hours)
Unlimited
No caps, no surprises. Verify as many addresses as you need every month.
- Unlimited verifications
- Up to 10 API keys
- Bulk CSV upload
- Webhooks
- Priority support (UK hours)
Prices exclude VAT; UK VAT (20%) is added at checkout where applicable.
Free Tools
Free email deliverability tools.
Weird bounce rates or inbox placement tanking? Nine times out of ten it's DNS, a blacklist or something odd in the headers. These tools help you narrow it down - no account, nothing stored.
Email Auth Checker
Pulls live DNS records for any domain and tells you what's wrong with your SPF, DKIM, DMARC and MX setup - with specific steps to fix it.
Use free tool →
Blacklist Checker
One Spamhaus listing can tank your inbox rates overnight. Run your domain or IP against 16 RBLs and get removal links for anything that comes up.
Use free tool →
Header Analyser
Paste raw headers from any email client and see the full relay path, SPF/DKIM/DMARC results, spam score and anything suspicious. Runs in your browser - nothing leaves your device.
Use free tool →
UK Email Guidance
UK email law, in plain English.
PECR, UK GDPR, ICO registration — most businesses sending email in the UK are tripping over at least one of these. We wrote the guides we wish existed.
Why ICO Registration Matters for UK Email Senders
Every UK business that processes personal data must register with the ICO. Here's what it means, why it matters, and what happens if you skip it.
Read article →
UK Email Marketing Law: PECR, UK GDPR, and What They Mean for You
Two separate laws govern commercial email in the UK. A plain-English breakdown of consent, the soft opt-in rule, and what enforcement actually looks like.
Read article →
UK GDPR and Email Compliance: A Practical Guide for 2026
Lawful basis, data minimisation, retention schedules, individual rights, and breach response — everything UK businesses need to handle email data correctly.
Read article →
FAQ
Common questions.
Quick answers about the API, UK hosting, and plans. For billing, limits, and troubleshooting, see Help & FAQ.
What does MailVerify do?
result, mx_host, catch-all and disposable flags, and the SMTP response code. No queue — you get JSON back synchronously.Do I need an SDK?
Where is my data processed?
What’s on the free plan?
How do I authenticate API requests?
Authorization: Bearer mv_live_… on each request. Full examples are in the docs.