MailFlow

Free plan Self-hostedWeb

What MailFlow is

MailFlow is a self-hosted, open-source webmail client that brings several email accounts into one browser interface. It supports Gmail, iCloud Mail, Outlook, Fastmail, and any IMAP server. Full-text search works across connected accounts, while WebSocket syncing brings in new messages in real time. An AI assistant can use OpenAI-compatible providers, including local models or cloud APIs, to summarize threads, draft replies, and answer questions about messages. MailFlow also offers inbox rules, automatic categories, spam feedback, one-click newsletter unsubscribing, rich-text composition, and conversation threads. Emails can be turned into Todoist tasks with a link back to the original message. Deployment uses Docker Compose with Docker Engine 24+ and Docker Compose v2. MailFlow runs on your infrastructure, with credentials encrypted at rest using AES-256 and listed authentication protections. The free personal plan is for non-commercial use; business licensing costs $500 a month, billed one-time per installation.

Who it suits

MailFlow suits people who want a browser-based unified inbox while keeping email on their own infrastructure. The free plan targets personal, family, and other non-commercial use; businesses can use the commercial license.

What it does well

Supports Gmail, iCloud Mail, Outlook, Fastmail, and IMAP
Real-time syncing and full-text search across accounts
AI can summarize, draft, and answer message questions
Creates linked Todoist tasks from emails
Includes inbox rules and newsletter unsubscribe tools

What to know first

No scheduled sending or calendar tools
No offline access
Business license costs $500 a month
Requires Docker Engine 24+ and Docker Compose v2

Plans

Plan	Billed and limits	Price
Personal & Open Source	Free forever · Non-commercial use · all features · unlimited accounts · community support	Free
Business Use	$500 per installation · one-time · Commercial deployments · all features · no AGPL obligations · modify and deploy privately	$500, paid once

As mailflow.sh lists them, read 8 Oct 2026. The maker's own page has the final word.

Verdict

MailFlow combines a broad account range, unified search, and self-hosted data control in one web client. Check its lack of offline, scheduling, and calendar features, and choose the plan that matches personal or commercial use.

Facts from MailFlow's own pages

AI assistant: The assistant connects to OpenAI-compatible providers, including local models or cloud APIs, to summarize threads, draft replies, and answer questions about messages. · mailflow.sh, 8 Oct 2026
App coverage: web · mailflow.sh, 23 Sept 2026
Calendar tools: No · mailflow.sh, 23 Sept 2026
Data control: MailFlow runs on the user's own infrastructure, and the site says email is not routed through third-party servers. · mailflow.sh, 8 Oct 2026
Deployment: MailFlow runs in Docker Compose; its setup instructions require Docker Engine 24+ and Docker Compose v2. · mailflow.sh, 8 Oct 2026
Free plan: Yes · mailflow.sh, 23 Sept 2026
Hosted offering: The site says a fully hosted version is coming soon and invites visitors to join its waitlist. · mailflow.sh, 8 Oct 2026
Integration: MailFlow can create Todoist tasks from emails and link back to the original message. · mailflow.sh, 8 Oct 2026
Intended users: The site describes the free plan as suitable for personal, family, or other non-commercial use, and offers a commercial license for businesses and managed hosting. · mailflow.sh, 8 Oct 2026
Native apps: The roadmap lists native iOS and Android apps and desktop apps for Windows, macOS, and Linux as future work. · mailflow.sh, 8 Oct 2026
Other features: It includes inbox rules, automatic email categories, spam feedback, one-click newsletter unsubscribe, rich-text composition, and conversation threads. · mailflow.sh, 8 Oct 2026
Product: MailFlow is a self-hosted, open-source webmail client that combines email accounts in a browser interface. · mailflow.sh, 8 Oct 2026
Search and sync: Full-text search covers connected accounts, and new mail syncs via WebSocket in real time. · mailflow.sh, 8 Oct 2026
Security: The site says stored email credentials are encrypted at rest with AES-256 and lists bcrypt password hashing, TOTP two-factor authentication, rate-limited authentication, and sanitized email HTML. · mailflow.sh, 8 Oct 2026
Scheduled sending: No · mailflow.sh, 23 Sept 2026
Support: The free personal plan includes community support; the commercial license includes direct email for questions, feedback, and business enquiries. · mailflow.sh, 8 Oct 2026
Supported email: It supports Gmail, iCloud Mail, Outlook, Fastmail, and any IMAP server. · mailflow.sh, 8 Oct 2026
Unified inbox: The unified inbox displays connected accounts in a single chronological feed. · mailflow.sh, 8 Oct 2026

Where MailFlow stands on Freedom251

Email clients#54 of 142