FrozenSpam vs MailInBlack
Honest comparison between two French challenge-response anti-spam solutions. Updated May 2026.
One-sentence verdict — FrozenSpam costs about 50% less, requires no quote, and adds outbound auto-whitelist. MailInBlack has 15 years of brand recognition and an established commercial team. Here's when each wins.
Detailed comparison
| Criterion | FrozenSpam | MailInBlack |
|---|---|---|
| Main mechanism | CR + 4 upstream layers | Challenge-response (visual CAPTCHA) |
| Outbound auto-whitelist | ✓ native | ✘ not implemented |
| Backscatter guard SPF/DMARC | ✓ | ≈ implicit |
| Public Solo pricing | €4.90 excl. VAT/month | ✘ quote |
| SMB 10-box annual cost | ~€468 excl. VAT/year | ~€1,800 excl. VAT/year (quote estimate) |
| Duration commitment | ✓ No commitment (monthly) | ✘ Annual commitment |
| Start | €1 first month, 15-day refund | Quote + annual contract |
| Hosting | France (ACME / OVH) | France (Marseille) |
| Gmail Workspace integration | ✓ via MX gateway | ≈ partial (declared) |
| Mail content not analyzed | ✓ by default | ≈ AV scan required |
| SmarterMail compatible | ✓ native (12 years in prod) | ✓ |
| Identified author | ✓ Emmanuel Daunizeau, 12-year track record | ✘ anonymous team |
| Customer dashboard | ✓ live app.frozenspam.com | ✓ |
| Public REST API | ✓ OpenAPI 3.1 | ≈ on request |
| Cancellation | Two-click dashboard, immediate | Contractual notice |
| GDPR DPA provided | ✓ standard + custom Volume | ✓ |
What MailInBlack does better
- Market recognition — Known to almost every French SMB. An argument for central buyers wary of "brand risk".
- Field sales force — Sales team able to visit, demo, accompany. If you want "human commercial contact", they have resources.
- Visual CAPTCHA — Their iconic locked mailbox is pleasant UX for the challenged sender.
- Mid-market volume — 500+ box clients for years; their experience counts at scale.
What FrozenSpam does better
- Outbound auto-whitelist — Guarantee that nobody you've written to gets blocked. MailInBlack doesn't do this. Zero documented false positive in our 12-year production.
- Transparent pricing — Published, no quote. You know what you pay before talking to anyone.
- €1 first month, 15-day refund — No imposed annual commitment.
- 50% cheaper on standard Team and SMB plans.
- Detailed 5-layer architecture. MailInBlack documents their architecture less.
- Single identified author — Emmanuel Daunizeau, 12 years on his own domains. You call the person who codes the product.
- Public OpenAPI 3.1 — Integrate without negotiation.
When to choose which
Choose MailInBlack if...
- You're a 200+ box mid-market with need for commercial accompaniment
- You value brand recognition over pricing transparency
- You want a polished visual CAPTCHA for senders
- You buy through formal RFPs
Choose FrozenSpam if...
- You're 1-50 boxes SMB/SME
- You want published pricing, no quote
- You value outbound auto-whitelist (technical zero false positive guarantee)
- You appreciate talking directly to the product author
- You want to start today for €1 and decide within 15 days
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