| What it does | Delightfully Boring Transactional Email
| Test real inbox placement and 42 technical checks with no signup required
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| Stage | Growing
| Established
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| Founded | Not given
| 2026
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| Based in | NL
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| Pricing model | freemium
| freemium
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| Pricing | Not given
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| Key features | - RESTful APIs for email sending
- SMTP relay servers
- Sandbox mode for testing
- CLI tool for developers
- Webhook and inbound message routing
- Raw delivery logs and transparency
- Engagement tracking with open and click tracking
- Sub-accounts for multi-tenant management
- Email archiving to S3-compatible services
| - Real inbox placement testing in Gmail, Outlook, Yahoo and more
- 42 technical checks across authentication, infrastructure, content and compliance
- SPF, DKIM and DMARC verification
- Blocklist lookup across 20+ DNS blocklists
- SpamAssassin-compatible spam score
- Link reputation checking
- HTML structure analysis
- Bulk sender rules for Gmail and Yahoo compliance
- Fix plan with recomputed score for corrections
- API and MCP server integration options
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| What makes it different | - 100% European infrastructure with GDPR compliance and no vendor lock-in
- Complete transparency with raw delivery logs not hidden behind paywalls
- Request idempotency to prevent duplicate emails from network errors
- Free dedicated IPs for high-volume senders
| - Two independent spam engine scores instead of one, including Gmail and Yahoo 2024 bulk sender rules
- Fix plan recomputes points by scoring corrected message rather than estimating
- No account, signup or credit card required to run tests
- Built by practitioner with years of live sending infrastructure debugging experience
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| Free plan | Not given
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| Open source | Not given
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| Platforms | Not given
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| Public API | Not given
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 47 ● no change since last check | 18 ● no change since last check |
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| Trust Flow (Majestic) | 25 | 17 |
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| Citation Flow (Majestic) | 42 | 25 |
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| Referring domains (Majestic) | 337 | 35 |
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