Number 1: 
Siel
SMS API and CPaaS platform for OTPs and alerts
- Email & notification APIs
- DR 0 no change since last check
Email & notification APIs
MXValidation
Free email deliverability testing and spam score checker
- Community votes
- 0
- DR by Ahrefs
- 0 no change since last check
Ahrefs Domain Rating benchmarked 14 Nov 2026, rebuilt 25 Oct 2026.
Test email authentication, spam signals, DNS and technical deliverability for free. Get a clear score, practical fixes and standalone email tools.
What it is
MXValidation is a free online tool that tests email deliverability by analyzing authentication, sending infrastructure and message content. Users copy a unique test address, send a representative email through their normal platform, and receive a report with a score out of 10 and detailed findings across ten checks including SPF, DKIM, DMARC, SpamAssassin signals, sending IP reputation, DNS configuration and message structure. The tool provides explanations of each finding and practical next steps for fixing problems. Beyond the main test, MXValidation offers standalone free DNS tools to check SPF, DKIM, DMARC and BIMI records, investigate MX servers and TLS policies, and an email viewer to inspect saved message files locally. The service is designed for developers testing transactional emails, marketing teams reviewing campaigns and administrators troubleshooting authentication and delivery issues.
What it is built with
- Deliverability score out of 10
Pricing
Pricing model: Freemium
Free account with 10 test emails per 24 hours; guests can access 3 tests per 24 hours
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MXValidation metrics
| Metric | Value |
|---|---|
| Domain Rating | 0 no change since last check |
| Trust Flow | 2 no change since last check |
| Citation Flow | 10 no change since last check |
| Referring domains | 11 no change since last check |
| External backlinks | 16 no change since last check |
Ahrefs Domain Rating benchmarked 14 Nov 2026, rebuilt 25 Oct 2026. Main build topic: Society/People (2). Majestic benchmarked 25 Oct 2026, rebuilt 25 Oct 2026. Link data built by Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.
MXValidation domain build sheet
Open the build sheet
| Domain age | 3 years |
|---|---|
| Registered | |
| Expires | |
| Registrar | Porkbun LLC |
| DNSSEC | Not signed |
MXValidation after-launch build log
Since MXValidation launched on Maker Launches on 25 October 2026, these are the figures we have tracked.
- Domain Rating (Ahrefs)
- 0 no change since launch
- 0 at launch (25 Oct 2026), 0 on 13 Nov 2026
- Trust Flow (Majestic)
- 2
- First measured 25 Oct 2026
- Referring domains (Majestic)
- 11
- First measured 25 Oct 2026
Day 19 since launch. Next receipt: day 30, 24 Nov 2026. We show what changed, not what caused it: many things affect these numbers. Nothing here is estimated.
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Questions from the bench
- How can I test if my email goes to spam?
- Copy your unique test address, send your email to it from the platform you use, then choose Check Your Score. The service analyzes authentication, SpamAssassin signals, sending-IP reputation, DNS and message structure to diagnose technical risks, though it does not test placement in Gmail, Outlook or other recipient inboxes.
- Is MXValidation free to use?
- Yes. Guests can view 3 tests per rolling 24 hours. A verified free account allows 10 tests in that period, with individual account limits varying. Standalone DNS tools and the local EML viewer do not consume the email-test allowance.
- What are SPF, DKIM and DMARC?
- SPF specifies which sending services may use an envelope-sender domain. DKIM signs a message so receivers can verify its signing domain and integrity. DMARC checks alignment with the visible From domain and publishes a policy for authentication failures.
- Does a high deliverability score guarantee inbox placement?
- No. Inbox placement depends on additional factors including sender reputation, recipient engagement and provider-specific filtering. The score summarizes the technical evidence available in the test but does not guarantee inbox placement with Gmail, Outlook or other providers.
- How long are my test emails and reports stored?
- A new test address accepts one message for 24 hours. Guest report details are retained for 3 days after receipt. Account-owned history and results remain until you delete the test or account. Original SMTP spool files have a separate retention period of approximately 30 days after successful synchronization.
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