| What it does | Complete email security and deliverability platform with DMARC, SPF, DKIM, BIMI, MTA-STS and TLS-RPT monitoring
| Free, open source email client with mail, calendar, contacts and AI
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| Stage | Not given
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| Founded | Not given
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| Based in | CZ
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| Pricing model | Freemium
| Open source
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| Pricing | Free plan at $0/month includes 1 domain and 1,000 emails/month. Starter at $14/month or $140/year includes 1 domain and unlimited emails. Professional at $29/month or $290/year includes 5 domains and 10 team members. Enterprise available at custom pricing for unlimited domains and team members. Addi
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| Key features | - DMARC monitoring with automatic RUA and RUF report processing
- SPF management with pass rate tracking and alignment monitoring
- DKIM tracking with signature and alignment rate monitoring
- Real-time blocklist monitoring across major providers
- MTA-STS hosting for enforcing TLS encryption
- TLS-RPT monitoring for encryption issues
- BIMI setup to display brand logos in email clients
- AI-powered analysis with GPT-powered report insights
- Custom alerts via email and Slack with webhook integration
- Role-based team access control and management
| - Mail over IMAP or POP3 with search by sender, date and attachments
- Calendar with CalDAV sync in day, week, month and year views
- Contacts with CardDAV sync with email, phone, company and birthday fields
- Read receipts showing Delivered, Opened or Bounced status
- AI summaries, replies and questions using your own API key
- Message and reply translation between languages
- Custom signature for each mailbox
- Built-in settings for Gmail, iCloud, Outlook, Yahoo, Fastmail, Zoho, GMX, Yandex and Proton Bridge
- Open source template for building branded mail clients
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| What makes it different | - AI-powered automatic analysis of DMARC, RUF, and TLS-RPT reports with plain-English explanations and actionable recommendations
- Single domain setup in just 5 minutes with guided configuration wizard
- Comprehensive support for all six major email authentication protocols
- Free plan available indefinitely without credit card required
- 99.9% uptime SLA with real-time 24/7 monitoring
| - Free and open source under MIT licence with no restrictions on use, modification or resale
- Works with any IMAP or POP3 mailbox including Gmail, iCloud, Outlook and others
- Calendar and contacts integrated in the same window with mail
- Bring your own AI from Anthropic, OpenAI, Google, xAI or Perplexity
- Build your own branded desktop app by customising the open source template
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 2 ● no change since last check | 11 ▼ −1 (down) since last check |
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| Trust Flow (Majestic) | 3 | 2 |
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| Citation Flow (Majestic) | 15 | 28 |
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| Referring domains (Majestic) | 5 | 41 |
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