Opterius Mail
Opterius Mail: A free self-hosted webmail client with practical administration tools. Ranked #118 of 142 in Email Clients by our editors (3.0/10); pricing: Free plan; best for self-hosted administrators needing basic webmail.
At a glance
- Editor score3.0 / 10
- PricingFree plan
- Best forSelf-hosted administrators needing basic webmail
- Free planYes
- Paid fromFree
- App coverageWeb
- Facts checked19 Sep 2026
Where it wins
- Free forever under the AGPL-3.0 open-source license
- Supports IMAP folders, full-text search, contacts, and signatures
- Adds mail-domain, alias, DKIM, DNS, queue, and spam administration
Where it doesn't
- Web-only access with no listed native desktop or mobile apps
- No unified inbox, offline access, calendar, AI, or scheduled sending
- Requires existing IMAP/SMTP infrastructure and self-hosted administration
Our verdict on Opterius Mail
Opterius Mail is a self-hosted webmail client for users and hosting operators running IMAP/SMTP infrastructure. It covers everyday email tasks, including reading, composing, replying, forwarding, drafts, signatures, folders, contacts, recipient autocomplete, unread counts, and full-text search across folders. The responsive browser interface supports phones and tablets, while the optional administration mode adds tools for mail domains, accounts, aliases, distribution groups, DKIM keys, DNS health checks, spam settings, and mail queues. It fits administrators who want webmail and mail-management functions in one open-source product.
The published Free plan is free forever and includes webmail and administration features. The software is distributed under the AGPL-3.0 license, making its open-source model central to the product. Opterius Mail connects through IMAP and SMTP and lists compatibility with Dovecot, Postfix, Courier, Exchange, Zimbra, and Opterius Panel. Panel single sign-on integration is also available. This combination makes it a practical fit for self-hosted environments that already manage mail servers and want a browser-based interface without adopting a separate hosted email service.
Its strongest distinction is the combination of basic webmail and optional infrastructure administration. A hosting operator can manage domains, accounts, aliases, and distribution groups, generate DKIM keys, check DNS health, and optionally work with queue and spam settings. The focus remains narrow: the listed feature set does not include a unified inbox, offline access, calendar, AI, or scheduled sending. Choose Opterius Mail for straightforward self-hosted webmail and mail-server administration; choose an alternative if broader productivity features or non-browser access are essential.
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Opterius Mail pricing
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Opterius Mail fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| App coverage | Web |
| Account limit | Not verified |
| Unified inbox | Not verified |
| Offline access | Not verified |
| Scheduled sending | Not verified |
| Calendar tools | Not verified |
| Deployment | Cloud, Self-hosted |
| Platforms | Web |
| Integrations | 8 integrations: IMAP, SMTP, Dovecot, Postfix, Courier, Exchange … |
| Pricing | Free plan (source) |
| Website | opterius.com |
| Facts checked | 19 Sep 2026 |
Opterius Mail integrations
Opterius Mail lists 8 integrations on its own site.
- IMAP
- SMTP
- Dovecot
- Postfix
- Courier
- Exchange
- Zimbra
- Opterius Panel
Alternatives to Opterius Mail
- 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 Opterius Mail alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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