| What it does | Transactional email API with per-key budgets and guardrails for AI agents
| 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 | US
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| Pricing model | Not given
| Open source
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| Key features | - Per-key send budgets enforced as emails are sent
- Approval queue for held and agent-requested sends
- Account-wide kill switch to pause all senders instantly
- Loop detection that holds suspicious repeated sends for review
- REST API and MCP server with identical operations
- Detailed email delivery logs with status and reasons
- DNS verification with copy-paste records and validation
- Bounce and complaint tracking per domain over rolling 7 days
- Batch sends up to 500 emails with per-item error reporting
| - 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 | - Up to 75% cheaper than Resend on equivalent email volumes
- Error responses name the exact fix needed instead of just a code
- Resend-compatible API eliminates need to rewrite integration code
| - 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) | 33 ● no change since last check | 11 ▼ −1 (down) since last check |
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| Trust Flow (Majestic) | 1 | 2 |
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| Citation Flow (Majestic) | 30 | 28 |
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| Referring domains (Majestic) | 31 | 41 |
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AgentiSend
CitrusMail