Free & Open-Source Microsoft Exchange Online Alternatives

Hosted business mail by Microsoft.

1. Mailcow ↗ FOSSPRIVATESELF-HOST
   Dockerized full self-hosted mail server.
   ●○○Easy · Reads common file formats
2. Mailu ↗ FOSSPRIVATESELF-HOST
   Simple self-hosted mail server with web admin.
   ●○○Easy · Reads common file formats
3. iRedMail ↗
   ●○○Easy · Reads common file formats