Bulk Email Database Verification Professional

We are looking for an experienced person/vendor to clean and verify a large email database with a strong focus on high accuracy and very competitive pricing.

We need checks such as:

Syntax & formatting
Domain/DNS/MX validation
Mailbox/SMTP verification where possible
Invalid/undeliverable emails
Catch-all detection
Disposable/temporary emails
Role-based emails
Risk/unknown classification

We are especially interested in vendors who have their own tools, scripts, APIs, infrastructure, or alternative verification methods that can deliver reliable results at a significantly lower cost than standard email verification platforms.

Requirements
High verification accuracy
Ability to process large volumes
Clear Valid / Invalid / Risky / Unknown classification
CSV/Excel output
Competitive bulk pricing
Data privacy/security
Sample/test batch before full processing
Please Include
Your verification methodology/tools
Expected accuracy/reliability
Pricing per / 1M emails
Processing capacity & turnaround time
How you handle catch-all, disposable and risky emails
Whether you can provide a test batch?
Relevant experience with bulk email verification

Long-term collaboration is possible for the right vendor based on accuracy, pricing and turnaround time.