Transactional
Cold email & newsletter
Tools
See your emails land in the inbox, not spam
Free deliverability monitoring on every plan
Node.js 
Python 
PHP 
C# Free Email Address Validator.
Every address runs through twelve layers — syntax, mail server, spam traps, disposables and more — before it ever touches your sending infrastructure. Type an email on the right and watch it happen.
No credit card · No expiration
Enter an email above to run all 12 checks, or
Why validate before you send
Every bounce costs
you inbox placement.
23% of a typical list is invalid, risky, or a spam trap. Gmail and Outlook count every bounce against you, and one send to a stale list can cost months of sender reputation.
One spam trap hit can blacklist your domain outright. Cleaning first takes minutes. Recovering takes months.
23%
of an average list will hurt your sender reputation
Sample of 5 millions addresses verified through Sendcorex, 2026.
Under the hood
Eight checks.
One call.
Every address runs the full pipeline. If any layer fails, you know exactly which one and why — no opaque "risky" verdict.
Syntax
Catches malformed addresses at the point of capture, before they ever enter your database.
Domain & SMTP
Removes addresses on inactive, parked, or invalid domains that will never accept mail.
MTA records
Confirms live MX records on every call, so a mail server is actually standing by to receive.
Hard bounce
An undetectable handshake verifies the mailbox exists — without sending anything the owner can see.
Spam traps
Cross-references known trap databases — the single fastest way to get a domain blacklisted.
Disposable
Flags throwaway addresses with short lifespans so you're talking to real people, not burner inboxes.
Catch-all
Identifies domains that say yes to everything — the most common source of silently wasted sends.
Duplicates
Collapses repeated addresses automatically, so you never pay to verify the same email twice.
Without writing code
Drop the file.
Get it back clean.
Drag in a CSV, Excel, or TXT export from any CRM. We dedupe it, run all eight checks on every row, and hand back a file split into safe-to-send and remove.
- Up to 1 million rows per upload
- Duplicates removed before you're charged for them
- Every original column preserved in the export
Drop your file here
.csv · .xlsx · .txt — up to 1M rows
99%
Inbox rate after cleaning
8
Checks per address
23%
Bad rows found on average
For developers
One endpoint.
Five minutes.
Verify at signup, before a send, or anywhere in your pipeline. A single POST returns all eight results and a boolean you can branch on — typically in under 200ms.
Examples in 8 languages, plus plain REST for everything else. No SDK required to get started.
// npm install axios
const axios = require('axios');
const response = await axios.post(
'https://graph.sendcorex.com/v3.0/inbox/check',
{ email: 'user@example.com' },
{ headers: { 'Authorization': API_KEY } }
);
const { valid, checks } = response.data;
console.log(valid, checks);{
"valid": true,
"checks": [
{ "check": "Format Validation", "status": "Passed" },
{ "check": "Domain Validation", "status": "Passed" },
{ "check": "Email Deliverability", "status": "Passed" }
]
}How we compare
Same accuracy.
A fraction of the price.
Most verification tools sell credits in fixed bundles and expire them after a year. Sendcorex credits are pay-as-you-go and never expire.
| Sendcorex Validator | Typical verification tool | |
|---|---|---|
| Price per email | From $0.0012 | $0.004 – $0.008 |
| Checks per address | 8, itemised in the response | 3–5, single verdict |
| Free credits | 100, no card required | 25–100, card often required |
| Credit expiry | Never | Typically 12 months |
| Duplicates | Removed before billing | Usually billed per row |
| API response time | ~200ms | 300ms – 2s |
Comparison based on publicly available pricing pages, 2026.
Pricing
Pay for what
you actually verify.
Credits never expire and duplicates are removed before you're charged. Drag the slider to size your list.
$9.60
one-time · credits never expire
Try it first
100 free validations on signup. No credit card, no expiration — enough to check a sample before you commit a cent.
Teams that stopped
guessing.
Easy to use and fairly priced for the service it provides. I've never run into any issues.
Gabriela S.
Business Development Coordinator
Our delivery rates jumped to 99.6%, so the ROI of our campaigns keeps growing. The pricing is incredible compared to other tools.
Maros K.
Head of Marketing, Mangools
We tested accuracy after the first list delivery: over 99.7%. Exactly what we needed.
Joe R.
Marketing and Advertising
Clean your list first.
100 free validations · No credit card required.