Question 1

What is a catch-all email domain?

Accepted Answer

A catch-all (or accept-all) domain is configured to accept every email sent to it, regardless of whether the specific mailbox exists. This means standard email verifiers cannot determine if individual addresses are valid, since the server always responds positively.

Question 2

How do you resolve catch-all addresses?

Accepted Answer

We use multi-signal behavioral analysis: SMTP latency profiling, banner fingerprinting, greylisting bypass protocols, and a machine learning model trained on 500M+ verifications. This lets us resolve catch-all addresses with 98.2% accuracy.

Question 3

What verification statuses do you return?

Accepted Answer

We return: Deliverable (confirmed valid), Undeliverable (confirmed invalid), Risky (role accounts, temporary issues), and Unknown (rare cases where resolution is not possible). We minimize Unknowns through our catch-all resolution engine.

Question 4

How is the B2B data sourced?

Accepted Answer

Through a cooperative network of 27+ licensed data contributors reconciled under structured governance. All records undergo triple-validation: source authentication, format normalization, and deliverability verification.

Question 5

What does 'HCP data' mean?

Accepted Answer

HCP stands for Healthcare Professional, physicians, nurse practitioners, pharmacists, hospital administrators, and allied health professionals. Our HCP database contains 4.2M+ verified contacts with NPI numbers, specialty, institution, and email addresses.

Question 6

Is the data GDPR compliant?

Accepted Answer

Yes. All B2B data is sourced through licensed partnerships with full GDPR compliance, including data processing agreements, right-to-erasure support, and EU data residency options.

Question 7

Do you offer an API?

Accepted Answer

Yes, REST API with support for single verification, bulk processing, and real-time streaming. Client libraries available in Python, Node.js, Go, and PHP. Documentation available at /resources/api-docs.

Question 8

What is your uptime SLA?

Accepted Answer

99.9% uptime SLA for enterprise customers with dedicated infrastructure. Standard customers run on our high-availability shared infrastructure with 99.5% uptime.

Question 9

Can I try it before buying?

Accepted Answer

Yes. Contact our sales team for a free trial with 1,000 verifications included. Data licensing customers can request a sample dataset before committing.

Question 10

How do you handle healthcare data compliance?

Accepted Answer

HCP data is handled with HIPAA-aligned safeguards. We offer BAA (Business Associate Agreements) for customers in covered entity relationships. Full compliance documentation is available for enterprise reviews.

Question 11

What integrations do you support?

Accepted Answer

Native integrations with Salesforce, HubSpot, Marketo, Outreach, Salesloft, Apollo.io, Zapier, Make, Segment, Klaviyo, and more. Full REST API for any other platform.

Question 12

How quickly do you process verifications?

Accepted Answer

Single verifications: under 200ms average. Bulk batches: processed at 50,000 per minute. Large lists (1M+) can be processed in under an hour via our batch API.

Frequently Asked Questions

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