# Free Email Deliverability & Typo Checker

> Free email deliverability and syntax checker. Test RFC 5322 syntax, live DNS MX mail exchangers, 60,000+ disposable domains, and fix domain typos instantly.

Hard bounces and disposable mailboxes destroy your domain reputation. Major mailbox providers like Gmail and Yahoo enforce immediate throttling and 550 rejections when bounce rates exceed 2%–5%. SadaSend’s sub-50ms verification engine inspects syntax, DNS mail exchangers, disposable domains, and role accounts before mail leaves.

## Checks Performed
- RFC 5322 recipient address syntax and mailbox naming structure
- Live DNS MX mail exchanger lookup and server availability
- Screening against 60,000+ known disposable, temporary, and burner domains
- Role distribution account detection (e.g. support@, admin@, billing@)
- Common domain typo auto-detection and correction (e.g. gmaill.com -> gmail.com)

## Sample Verification (alex@example.com)
Deliverable recipient mailbox with valid DNS mail exchangers and zero spam or burner flags. Safe for transactional dispatch.

| Check | Verdict | Details |
| --- | --- | --- |
| Overall deliverability | PASS | Deliverable · 100/100 Quality Score |
| RFC 5322 syntax | PASS | Valid mailbox format |
| MX mail exchangers | PASS | mail.example.com · Live |
| Disposable status | PASS | Persistent domain |
| Role-based account | PASS | Individual recipient |

## Frequently Asked Questions
### Why should I verify email addresses before sending?

Gmail, Yahoo, and Outlook aggressively monitor bounce rates. If more than 2% to 5% of your dispatches bounce due to invalid addresses, typos, or deleted mailboxes, your sending domain will be throttled or blacklisted. Pre-send verification catches bad addresses before they bounce.

### How fast is SadaSend email verification?

SadaSend evaluates email addresses in under 50ms using high-performance in-memory syntax parsers, an LRU-cached DNS resolver, and a real-time database of over 60,000 disposable burner domains.

### Can SadaSend automatically detect and repair typos?

Yes. The verification engine analyzes common keystroke errors across major consumer providers (e.g., gmaill.com, yaho.com, hotmial.com) and suggests the correct domain instantaneously.

### How does the free limit work?

Guests can verify up to 5 addresses per day without creating an account. Creating a free account unlocks 100 free verification credits every month + programmatic REST and MCP API access.