Use Case
gmial.com, yaho.com, outlok.com — your users make these mistakes every day. Most validators reject them. MailSentry tells you exactly what they meant.
No credit card · No overage charges · Credits never expire
The math nobody shows you
3-5%
of signups have email typos
300
lost activations per 10K signups
$15K+
annual revenue lost at $50 LTV
A regex check says “invalid” and the user bounces. MailSentry says “Did you mean john@gmail.com?” and you save the signup.
How it works
Each layer catches what the others miss. Together they give you a complete picture of every email entering your signup form.
gmial.com → gmail.com. We check against 100+ common domains using Levenshtein distance. Your form shows ‘Did you mean?’ instead of ‘Invalid email.’
5,400+ throwaway domains blocked. Guerrillamail, Tempmail, Yopmail — caught before they waste your onboarding flow.
RFC 5322 compliant. Plus-addressing (user+tag@) accepted. Unicode/IDN domains handled via punycode. We don’t reject valid emails.
asdfkjh38274@ gets flagged. Keyboard mashing, repeated characters, consonant clusters — classified by pattern type, not just a boolean.
Developer experience
curl -X POST https://mailsentry.dev/api/v1/verify \
-H "X-API-Key: ms_live_..." \
-H "Content-Type: application/json" \
-d '{"email": "john@gmial.com"}'{
"score": 15,
"verdict": "invalid",
"warning": "Possible typo detected",
"checks": {
"typo": { "has_typo": true, "suggestion": "john@gmail.com" },
"disposable": { "is_disposable": false, "list_updated": "2026-04-26" },
"syntax": { "valid": true, "plus_alias": null },
"gibberish": { "is_gibberish": false, "pattern": null }
}
}The typo.suggestion field gives you everything you need to build a “Did you mean?” UI. One call, one field, zero complexity.
const result = await fetch('/api/v1/verify', {
method: 'POST',
headers: { 'X-API-Key': 'ms_live_...', 'Content-Type': 'application/json' },
body: JSON.stringify({ email: input.value })
}).then(r => r.json())
if (result.checks.typo.has_typo) {
showPrompt(`Did you mean ${result.checks.typo.suggestion}?`)
}Comparison
| Feature | MailSentry | ZeroBounce | NeverBounce |
|---|---|---|---|
| Typo correction | Automatic + suggestion | Standard | Automatic |
| Disposable list size | 5,400+ | Not published | Not published |
| Plus-addressing | Accepted | Accepted | Accepted |
| Gibberish detection | Pattern classified | Not available | Not available |
| Free plan | 1,000/mo recurring | 100/mo | 1,000 one-time |