Top 4 Shell Mailserver Projects

docker-mailserver

92 13,292 9.5 Shell

Production-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) running inside a container.

Project mention: Alternative to MailCow | /r/selfhosted | 2023-06-04

I can recommend Docker mailserver (it also works with Podman). It is already pretty lightweight but you can even make it lighter and it has an active community as well as regular updates.

docker-postfix

6 469 8.4 Shell

Simple SMTP server / postfix null relay host for your Docker and Kubernetes containers. Based on Alpine Linux.
InfluxDB

www.influxdata.com sponsored

Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
poste.io

1 133 10.0 Shell

poste.io mail server, but with IP management and custom webmail plugins
mailserver

1 124 4.1 Shell

Simple and full-featured mail server using Docker (by mailserver2)

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).