grommunio
grommunio: A self-hosted email and groupware server with broad protocol support and tiered partner support. Ranked #20 of 31 in Email Server Software by our editors (7.4/10); pricing: Free plan; best for teams wanting affordable Exchange-compatible self-hosting.
At a glance
- Editor score7.4 / 10
- PricingFree plan
- Best forTeams wanting affordable Exchange-compatible self-hosting
- Free planYes
- Paid from€1.99/user/mo
- DeploymentHybrid
- Facts checked4 Oct 2026
Where it wins
- Supports Outlook connectivity and Exchange ActiveSync mobile sync.
- Combines mail, calendar, contacts, notes, tasks, and shared mailboxes.
- Offers LDAP and Active Directory provisioning plus migration tools.
Where it doesn't
- Community is self-supported and has no manufacturer support.
- Commercial support depends on a grommunio partner.
- Enterprise pricing is negotiated rather than listed as a fixed monthly rate.
Our verdict on grommunio
Organizations that want to operate their own communications infrastructure can use grommunio for email and collaboration, either self-hosted or through a hosting partner. It combines mailbox services with a web client for calendars, contacts, notes, and tasks, and includes shared mailboxes, public folders, and global address lists. That makes it relevant to teams seeking an Exchange-compatible server with groupware rather than email delivery alone.
Protocol and ecosystem breadth are central to its fit. Mail services support SMTP, IMAP, and POP3, while Outlook connectivity uses MAPI/HTTP and Exchange Web Services. Exchange ActiveSync synchronizes mobile email, calendars, and contacts. LDAP and Active Directory support authentication and provisioning, and OpenID Connect and SAML 2.0 providers are listed as integrations. Migration tools cover Exchange PST imports and IMAP servers; multi-tenant services, delegated administration, and clustered high availability with failover address larger operational needs. Choose it when these compatibility and administration capabilities matter; a team needing only a basic hosted inbox may find this server scope unnecessary.
The Community plan is free for up to five users and is self-supported through community channels, with no manufacturer support. Basic costs €1.99 per user per month, with sales and support handled by a grommunio partner. Plus is €3.99 per user per month and adds partner support backed by grommunio; Business is €5.49 per user per month and adds enhanced response. Enterprise has a negotiated SLA, onboarding, and roadmap alignment. The published tiers make support level a key buying distinction: Community suits teams prepared to support themselves, while organizations requiring commercial assistance should consider a paid plan. Enterprise is suited to buyers who need negotiated service terms rather than a fixed listed price.
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grommunio pricing
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grommunio fact sheet
| Free plan | Yes |
|---|---|
| Paid from | €1.99/user/mo |
| Deployment | Hybrid |
| Mail transfer agent | Yes |
| Mailbox server | Yes |
| Integrated mail server | Yes |
| Email protocols | SMTP, IMAP, POP3, MAPI/HTTP, RPC/HTTP, EAS, EWS, HTTPS, CalDAV, CardDAV, LDAP |
| Directory integration | Yes |
| Deployment | Cloud, Self-hosted |
| Platforms | Web, Windows, macOS, Linux, iOS, Android |
| Compliance & security | GDPR |
| Support | Community, Docs |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 6 integrations: Microsoft Outlook, Microsoft Exchange, LDAP, Active Directory, OpenID Connect providers, SAML 2.0 identity providers |
| Pricing | Free plan (source) |
| Website | grommunio.com |
| Facts checked | 4 Oct 2026 |
grommunio integrations
grommunio lists 6 integrations on its own site.
- Microsoft Outlook
- Microsoft Exchange
- LDAP
- Active Directory
- OpenID Connect providers
- SAML 2.0 identity providers
Alternatives to grommunio
- Microsoft Exchange OnlineManaged Exchange email with Outlook access, filtering, archiving, and migration tools.9.3
- Apache JamesA flexible self-hosted mail platform with broad protocol support and configurable storage.9.1
- DovecotA focused, self-hosted mailbox server with filtering, search, and migration tools.9.0
See all grommunio alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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