Subrelay is a mail list software, works standalone independently from SMTP server. It uses external SMTP server to send messages, and external IMAP server to listen for the incoming messages.

Build instructions

In order to build run the following commands:

./autogen.sh
./configure --prefix=/usr/local # or your preffered path
make
sudo make install

Documentation

You can find documentation after installation. There are few man pages:

sbrlctrl (1)
subrelayd (8)
subrelay.conf (5)

Requirements

In order to run this mail list server you should obtain:

A mail box with IMAPs access
Remote SMTPs server
Credentials for them

You could run this software on a box of your homelab with internet access, or use cheap VPS hosting for that.

Notes

Read KNOWN_ISSUES before starting to use this software. It's an early version, so consider backups.