Email data quality infrastructure

SMTP health checks
for clean data pipelines

Run real-time SMTP handshakes, MX record lookups, and bounce analysis on any email dataset. Get structured output — valid, invalid, and unknown — ready for your next step.

SMTP RCPT handshake
MX / DNS resolution
Bounce detection
Disposable detection
Syntax validation
CSV export
$ input.txt — paste dataset or upload file
0 addresses detected ↑ supports any text format
Create free account →
Ready
| Sign in to run validation | 0 queued
0 / 0 0%
// how it works

Four-layer verification pipeline

01
Syntax check
RFC 5321/5322 compliant regex validation. Catches malformed addresses, invalid TLDs, and structural errors instantly.
~0ms
02
DNS / MX lookup
Resolves MX records for the domain. Confirms the domain is configured to receive mail and identifies the mail server.
~100ms
03
SMTP handshake
Opens a real SMTP connection to the mail server and sends RCPT TO probe. Reads 250/550 response codes without sending any email.
~1–2s
04
Bounce analysis
For providers that block RCPT probing (Yahoo, AOL), a test send + bounce detection method is used to confirm delivery.
~10–30s
// pricing

Pay-as-you-need credits

Starter
$9
one-time · 30 day validity
1,000 validations · $0.009 each
  • SMTP + MX verification
  • Bulk CSV upload & export
  • Filtered output by status
  • Email support
Get Starter
BEST VALUE
Pro
$19
one-time · 60 day validity
2,500 validations · $0.0076 each
  • Everything in Starter
  • Bounce detection included
  • Priority processing
  • API access
  • Priority support
Get Pro