Mailfox vs BillionVerify
A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.
Mailfox compared with BillionVerify
| Detail | M
Mailfox | 
BillionVerify |
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| What it does | Get instant notification of failed emails from your transactional email providers
| The email verification tool built for scale with real-time SMTP checks and 99.9% accuracy
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| Stage | Not given
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| Founded | Not given
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| Based in | AT
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| Pricing model | Paid
| Freemium
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| Pricing | One-time payment: 99€
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| Key features | - Instant notifications for email failures
- Support for Mailgun, SendGrid, Mailjet, Brevo, Resend and Postmark
- No-code setup in one minute
- Track multiple email event types
- Connect unlimited providers
- Unlimited email event tracking
- Multiple provider support simultaneously
- Webhook-based architecture
| - Live SMTP mailbox verification checking if a mailbox exists and accepts mail
- Bulk file upload and processing for CSV and XLSX lists
- REST API with batch requests supporting up to 50 addresses per call
- Risk flagging for disposable, role, and catch-all addresses
- MCP server integration for AI agents like Claude and Cursor
- Email finder turning a name and company domain into verified work address
- White-label service with custom domain and client workspaces
- Free email tools including SPF, DKIM, DMARC checkers and DNS lookups
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| What makes it different | - One-time payment model with unlimited lifetime use
- No API tokens or credentials required
- Real-time webhook notifications from email providers
| - 99.9% accuracy through multi-layer verification (syntax, domain, MX, SMTP, risk signals)
- Lowest pricing: $0.001 per email on entry plans, down to $0.00014 on annual plans
- You only pay for definite results; unknown results and invalid syntax addresses are free
- Credits never expire whether purchased or earned through daily free allowance
- Works across multiple interfaces: dashboard, API, MCP server, and AI agent skills
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 12 ▼ −17 (down) since last check | 60 ▲ +1 (up) since last check |
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| Trust Flow (Majestic) | 9 | 10 |
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| Citation Flow (Majestic) | 22 | 25 |
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| Referring domains (Majestic) | 91 | 347 |
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4 details filled in for both companies.
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