Description
Koltrix offers a comprehensive email solution designed for SaaS teams, integrating an AI-powered team inbox with a robust transactional email API and SMTP relay. The platform allows users to host their team inbox on their own domain, providing a seamless and branded experience. A core feature is its AI capability, which intelligently sorts incoming mail, scores spam, and drafts replies, significantly reducing manual effort. This AI functionality can be toggled on or off per workspace, with privacy safeguards ensuring that AI providers (OpenRouter with TypeSafe's Jev, Google Gemini, and DeepSeek models) are not permitted to train on user email content.
Read More
The system is built to enhance team collaboration and efficiency. Agents within Koltrix can propose email drafts, and with an optional 'Auto' setting, can send replies autonomously under strict conditions, including high confidence, known recipients, and adherence to daily caps and quiet hours. Every autonomous send is logged, and a kill switch allows all agents to revert to a 'Suggest' mode. Koltrix also features an MCP server, enabling integration with AI assistants like Claude, ChatGPT, and Cursor. These assistants can search, read, label, archive mail, and write drafts for review, with sending capabilities requiring explicit admin and user approval.
Security and data privacy are paramount for Koltrix. Each workspace operates within its own isolated PostgreSQL database schema, ensuring data separation. The platform employs HTTPS, opportunistic TLS on SMTP, and DKIM signing for outbound mail. Inbound messages are scanned for prompt injection, assigned a risk level, and high-risk messages can be quarantined from agents. User data is stored on self-run servers in Frankfurt, Germany (European Union), with attachments stored on proprietary storage, not relying on third-party email infrastructure.
Koltrix offers flexible pricing plans, including Starter and Pro tiers, with a 7-day free trial that requires no credit card. Plans include a set number of mailboxes, domains, and team seats, with options to add more mailboxes and storage as needed. Extra mailboxes are priced at $1 per month or $9.50 annually, while storage packages range from +5 GB for $2/month to +50 GB for $12/month. The platform is currently a web app, with IMAP and SMTP access for desktop and mobile clients planned for future releases. Koltrix aims to provide a secure, efficient, and AI-augmented email management system for SaaS businesses.
- CategoryAI Email Assistants
- Pricing ModelFreemium
- DeploymentCloud
- PlatformsWeb
Koltrix's Core Features
AI-first team inbox on your custom domain
Transactional email API and SMTP relay
AI-powered email sorting and spam scoring
AI-driven draft generation for replies
Integration with Claude, ChatGPT, and Cursor via MCP server
Agent mailboxes with scoped API keys and audit logs
Prompt injection shield for inbound messages
Autonomous sending mode for agents (optional and controlled)
Custom domain support with guided DNS setup (MX, SPF, DKIM, DMARC)
Workspace isolation with separate PostgreSQL schemas
Encryption in transit (HTTPS, opportunistic TLS)
Outbound mail DKIM signing
Rate limits on authentication, search, and AI actions
Remote image proxy and tracker stripping in emails
Data storage in Frankfurt, Germany (European Union)
How to use Koltrix?
Add Your Domain: Publish five DNS records (proof, MX, SPF, DKIM, DMARC) generated by Koltrix to verify ownership and direct incoming mail.
Configure AI Agents: Turn on AI for your workspace to enable sorting, spam scoring, summaries, and drafts, or keep it off for server-side processing only.
Set Agent Autonomy: Choose between 'Suggest' (agents draft, human sends) or 'Auto' (agents send autonomously under strict conditions) for each agent.
Connect AI Assistants: Approve MCP apps like Claude or ChatGPT with your Koltrix sign-in to allow them to search, read, label, archive, and draft mail.
Manage Mailboxes and Storage: Add extra mailboxes or storage packages to your plan as your team's needs grow, billed monthly or annually.
Monitor Limits: Keep track of daily inbox send limits and monthly API/SMTP send limits, which are enforced by the API.
Koltrix's Use Cases
- Team Email Management
- Transactional Email Sending
- AI Agent Workflows
- AI Assistant Integration
- Email Security and Privacy
- Customer Support Automation
- Sales Outreach Follow-ups
- Email Deliverability Monitoring
