| What it does | An email delivery service that actually delivers
| Free, open source email client with mail, calendar, contacts and AI
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| Stage | Established
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| Founded | Not given
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| Based in | Not given
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| Pricing model | Paid
| Open source
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| Pricing | $5/month platform fee plus $0.00035 per email. No tiers, volume commitments, or overage fees. Includes 1,000 free test emails.
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| Key features | - Email API and SMTP integration
- Separate transactional and promotional email sending
- Multi-tenant environment support
- Customer isolation for platform senders
- Spam detection and sender reputation protection
- Custom domain support
- Email performance analytics
- SDKs in multiple programming languages
- Domain and suppression management
- Email tracking and opens/clicks monitoring
| - 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 | - No tier commitments or overage fees - usage-based pricing only
- Bootstrapped and independent with no investors
- Built for platforms sending email on behalf of users
- Team with decades of email infrastructure and deliverability experience
- Significantly cheaper than competitors at all volume levels
| - 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) | 6 ▼ −1 (down) since last check | 11 ▼ −1 (down) since last check |
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| Trust Flow (Majestic) | 6 | 2 |
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| Citation Flow (Majestic) | 27 | 28 |
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| Referring domains (Majestic) | 114 | 41 |
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CitrusMail