MailFlow
MailFlow: A flexible self-hosted inbox with AI assistance, but no offline, scheduling, or calendar tools. Ranked #67 of 142 in Email Clients by our editors (3.1/10); pricing: Free plan; best for self-hosted email with AI assistance.
At a glance
- Editor score3.1 / 10
- PricingFree plan
- Best forSelf-hosted email with AI assistance
- Free planYes
- Paid from$500/unit one-time
- App coverageWeb
- Facts checked23 Sep 2026
Where it wins
- Unified inbox for Gmail, iCloud, Outlook, Fastmail, and IMAP
- AI assistance for summaries, drafts, and message questions
- Free personal plan with unlimited accounts and full source access
Where it doesn't
- No offline access
- No send-later scheduling
- No calendar tools
Our verdict on MailFlow
MailFlow is a self-hosted, open-source webmail client for people who want to manage multiple email accounts through one browser-based interface. It connects Gmail, iCloud Mail, Outlook, Fastmail, and custom IMAP accounts, then brings messages into a unified inbox with full-text search, conversation threading, real-time synchronization, and notifications. Rich-text composition supports attachments, while inbox rules, sender block lists, automatic categorization, and two-factor authentication cover everyday organization and account protection. Installable desktop and mobile PWAs extend access beyond a standard browser, and the AI assistant can summarize messages, help draft replies, and answer questions about email.
Pricing is straightforward. The Personal & Open Source plan costs $0 forever and includes all features, unlimited accounts, full source code access, and community support. Personal self-hosting is available under AGPL-3.0. The Commercial License costs $500 per installation as a one-time payment and includes all features, no AGPL obligations, private modification and deployment, and direct email support. That structure makes MailFlow particularly suitable for individuals and teams that can self-host and are comfortable with open-source licensing. Organizations that need private commercial deployment can choose the paid license without giving up the feature set.
The standout is the combination of multi-provider mail management and AI assistance in a self-hosted client. Todoist integration adds a task-oriented connection, while search, categorization, rules, and sender controls help keep a consolidated inbox manageable. The trade-off is a narrower productivity scope: MailFlow does not provide offline access, send-later scheduling, or calendar tools. Choose it for centralized email, source access, and deployment control; choose an alternative if offline work, timed sending, or integrated calendar planning is central to your workflow.
Your product? Our editors can test MailFlow in depth and publish a review, labelled as paid · from $149/mo →
MailFlow pricing
All 2 MailFlow plans and prices →
MailFlow fact sheet
| Free plan | Yes |
|---|---|
| Paid from | $500/unit one-time |
| App coverage | Web |
| Account limit | Not verified |
| Unified inbox | Yes |
| Offline access | Not verified |
| Scheduled sending | No |
| Calendar tools | No |
| Deployment | Self-hosted, Browser extension |
| Platforms | Web |
| Compliance & security | 2FA |
| Support | Community, Docs, Email |
| Built for | Solo, Small business (editorial estimate) |
| Integrations | 7 integrations: Gmail, iCloud Mail, Outlook, Fastmail, IMAP, Todoist … |
| Pricing | Free plan (source) |
| Website | mailflow.sh |
| Facts checked | 23 Sep 2026 |
MailFlow integrations
MailFlow lists 7 integrations on its own site.
- Gmail
- iCloud Mail
- Outlook
- Fastmail
- IMAP
- Todoist
- OpenAI-compatible AI providers
Alternatives to MailFlow
- Mozilla ThunderbirdA capable free client for multi-account email, offline access, and desktop productivity tools.9.4
- Zoho MailA flexible hosted email service with free access, migration tools, and Zoho collaboration options.9.2
- Apple MailA capable Apple-focused email client with unified inboxes, scheduling, privacy controls, and AI assistance.9.1
See all MailFlow alternatives →
Also Ranked In
MailFlow is ranked in 2 of our directories.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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