PMTACore Email Validator

Email Validation

PMTAcore includes a powerful email validation engine that checks whether email addresses are real, deliverable, and safe to send to. Validate a single address instantly or process entire lists with thousands of emails in bulk.

PMTAcore Email Validator showing validation results with valid, invalid, and risky statuses

What It Does

The validator runs multiple checks on each email address to determine if it is valid, invalid, or risky. Depending on your chosen validation level, it performs:

Email format and syntax verification
MX record lookup to confirm the domain can receive mail
Disposable and spamtrap email detection
Typo suggestions for common domain misspellings
SMTP mailbox verification to check if the actual mailbox exists
SPF, DMARC, and DNSBL blacklist checks
Catch-all domain detection
Quality scoring from 0-100 for each email

Two Validation Levels

Basic (Fast) — Checks format, MX records, disposable detection, and typo suggestions. Does not require port 25 access. Great for quick list cleaning.

Advanced (SMTP + DNS) — Everything in Basic plus SMTP mailbox verification, SPF/DMARC checks, DNSBL blacklist lookups, and reverse DNS. More accurate but requires port 25 or an external SMTP server configured in settings.

Guides

Single & Bulk Validation — How to validate individual emails and upload lists for bulk processing
Validation Settings — Configure validation level, thread count, SMTP relay, and authenticated SMTP server