About MailCheckup | Clearer Evidence, Better Email Decisions

Q: Who operates MailCheckup and where is the company based?

MailCheckup is operated by Secuno LLC , a registered United States corporate entity headquartered at 30 N Gould St, Sheridan, Wyoming, USA 82801. Corporate phone: +1 (315) 961-7074.

ON THIS PAGE

The problem with legacy email verification
Our five architectural commitments
Corporate identity & legal registration
Responsible infrastructure & privacy
Frequently asked questions about MailCheckup

1. The problem with legacy email verification

For more than a decade, the email verification industry has operated on opacity. Legacy tools market deceptive "99.9% accuracy" promises, conceal actual SMTP responses behind black-box quality scores, and quietly confiscate unused credits after 365 days. Worst of all, many discount providers subsidize their low costs by harvesting customer lists and enriching secondary data broker databases.

MailCheckup was designed from the ground up as an antidote to these practices. We believe that deliverability operators, sales leaders, and developers deserve truthful technical evidence, transparent wholesale pricing, and ironclad data privacy.

2. Our five architectural commitments

The table below summarizes how MailCheckup systematically eliminates common industry traps:

Operating Dimension	Legacy Verifier Convention	The MailCheckup Standard	Customer Value
Result Transparency	Vague 0–100 probability score	Granular SMTP RFC reason codes (250, 550, 451)	Know exactly why an address passed or failed.
Inconclusive Checks	Billed full or half credit on timeout	100% Free ($0); holds instantly released	Save 15%–20% on lists with greylisted servers.
Credit Lifespan	Forfeited after 365 days or cycle end	Packs never expire; permanent ledger	No forced repurchase for seasonal senders.
Customer Data Privacy	Scraped and resold to data brokers	Processed in memory under GDPR Art. 28	Your proprietary leads remain strictly confidential.
API Integration	Sluggish 800ms+ round trips	Sub-180ms p95 latency with MCP tools	Seamless real-time signup form protection.

3. Corporate identity & legal registration

MailCheckup operates with transparent corporate disclosure. We publish our legal operating entity (Secuno LLC), corporate headquarters, and verified direct contact lines:

Corporate Attribute	Official Company Record	Verification Reference
Legal Operating Entity	Secuno LLC	Registered in Wyoming, United States
Headquarters Address	30 N Gould St, Sheridan, WY 82801, USA	Physical registered office location
Contact Telephone	+1 (315) 961-7074	Direct corporate and operator inquiries
Support Email	support@mailcheckup.net	Technical and deliverability specialists
Billing Email	billing@mailcheckup.net	Invoicing and Stripe payment inquiries
Primary Payment Processor	Stripe Checkout	PCI-DSS Level 1 compliant infrastructure

4. Responsible infrastructure & privacy

When you verify contacts on MailCheckup, your data is processed ephemerally in RAM and stored encrypted at rest with AES-256 GCM. Once your CSV export is completed, you have full controls to purge records immediately. We comply with GDPR Article 28 and never utilize customer emails to enrich secondary search engines or cold outreach databases.

5. Frequently asked questions about MailCheckup

Who operates MailCheckup and where is the company based?

MailCheckup is operated by Secuno LLC, a registered United States corporate entity headquartered at 30 N Gould St, Sheridan, Wyoming, USA 82801. Corporate phone: +1 (315) 961-7074.

Why does MailCheckup avoid marketing '99.9% accuracy' claims?

Marketing '99.9% accuracy' badges is an industry gimmick. In the real world, mail server configurations are dynamic: corporate servers employ greylisting, firewall deferrals, and catch-all accept-all policies. MailCheckup prioritizes empirical honesty: we tell you exactly what the destination server answered (250, 550, or 451) and never bill you when the answer is inconclusive.

Does MailCheckup sell or enrich customer contact lists?

Never. MailCheckup operates under strict GDPR Article 28 data processor obligations. Customer email lists are verified ephemerally, returned to the customer, and never retained, cross-referenced, scraped, or monetized in any secondary database.

How are credit balances protected across months or years?

On-demand credit packs purchased through Stripe Checkout remain permanently valid in your workspace ledger. They do not expire after 30 days or 365 days. If you also maintain a monthly subscription, our ledger automatically consumes the soonest-expiring monthly credits first.

What is the $0 Free Unknown Policy?

If a destination mail server deferrals a check (SMTP 451/421 greylisting) or experiences a network connection timeout, the outcome is inconclusive. MailCheckup charges 0 credits ($0.00) for all unknown outcomes, instantly releasing any temporary reservation holds back to your account.

Does MailCheckup offer customer support from real engineers?

Yes. We do not use outsourced call centers or automated deflection chatbots. Product inquiries are answered directly by deliverability specialists via support@mailcheckup.net, and billing inquiries are handled via billing@mailcheckup.net with guaranteed sub-4-hour SLAs during business hours.

Clearer evidence. Better email decisions.

Foundational Architectural Principles

Clarity over Black-Box Scores

1. The problem with legacy email verification

2. Our five architectural commitments

3. Corporate identity & legal registration

4. Responsible infrastructure & privacy

5. Frequently asked questions about MailCheckup

Clearer evidence. Better email decisions.

Foundational Architectural Principles

Clarity over Black-Box Scores

1. The problem with legacy email verification

2. Our five architectural commitments

3. Corporate identity & legal registration

4. Responsible infrastructure & privacy

5. Frequently asked questions about MailCheckup

A clearer next step.