docker-mailserver
Complete mail server in a container with SMTP, IMAP, spam filtering and antivirus.
MITPermissive
SaaS: YesClosed product: Yes
- GitHub stars
- 18.9k
- Deployment
- Docker
- Login/SSO
- LDAP
Open-source alternatives to Microsoft Exchange Online
Microsoft Exchange Online in the Communication category. These are the open alternatives we recommend looking at.
Mail-in-a-Box
Makes it easy to set up your own mail server with everything needed on a dedicated machine.
CC0-1.0Permissive
SaaS: YesClosed product: Yes
- GitHub stars
- 15.4k
- Deployment
- Server
Stalwart Mail Server
Mail and collaboration server in Rust supporting IMAP, JMAP, SMTP, calendars and contacts.
AGPL-3.0Network copyleft (AGPL)
SaaS: Yes, with conditionsClosed product: No
- GitHub stars
- 14.9k
- Deployment
- Docker
- Login/SSO
- OIDC, LDAP
mailcow
Mail server in Docker with webmail, groupware, spam filtering and an admin interface.
GPL-3.0Strong copyleft
SaaS: YesClosed product: No
- GitHub stars
- 13.6k
- Deployment
- Docker
- Login/SSO
- OIDC, LDAP
Mailu
Email server that runs as Docker containers, with webmail and spam filtering.
MITPermissive
SaaS: YesClosed product: Yes
- GitHub stars
- 7.5k
- Deployment
- Docker
Maddy Mail Server
Mail server in a single program that replaces several separate parts (SMTP, IMAP, DKIM and similar).
GPL-3.0Strong copyleft
SaaS: YesClosed product: No
- GitHub stars
- 6.1k
- Deployment
- Server
Mox
Modern mail server in a single program, built to be easy to run yourself.
MITPermissive
SaaS: YesClosed product: Yes
- GitHub stars
- 5.9k
- Deployment
- Server
Modoboa
Mail hosting platform with a web admin for domains, accounts and filters.
ISCPermissive
SaaS: YesClosed product: Yes
- GitHub stars
- 3.5k
- Deployment
- Server
WildDuck
Scalable IMAP and POP3 server that stores mail in MongoDB.
EUPL-1.2Strong copyleft
SaaS: YesClosed product: No
- GitHub stars
- 2.1k
- Deployment
- Server
iRedMail
Script that installs a complete mail server on mainstream Linux and BSD systems.
GPL-3.0Strong copyleft
SaaS: YesClosed product: No
- GitHub stars
- 1.8k
- Deployment
- Server
- Login/SSO
- LDAP
This is guidance, not legal advice (inte juridisk rådgivning). Check with a lawyer before deciding.
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