This is a simple lightweight mail server which receives emails to a set of addresses and forwards them to a given address.

One possible use case: You have a domain (or domains) and you want to have email addresses for those domains (for instance, webmaster@mydomain1.com and firstname.lastname@mydomain2.com). Instead of setting up complex mail servers on your domains, you just want to forward those emails to your existing email address. If you want to send from these custom addresses, use your mail application to write your custom address in the "from" field.

Install Lamson. Create a file config/local_settings.py and set the following:

• relay_config

• receiver_config

• forward_address

• receive_addresses

Obviously, set the MX records on your nameservers to point to the server on which you are running this.

For security, create a new user:

mailserver
su mailserver

In its home directory, clone the project:

cd /home/mailserver
git clone https://github.com/jluttine/mail-forwarder.git

Create a Python virtual environment:

cd mail-forwarder
virtualenv --python=/usr/bin/python2 ENV
source ENV/bin/activate

Install Lamson:

pip install lamson

Create a startup script start with the following content:

#!/bin/bash
cd /home/mailserver/mail-forwarder
source ENV/bin/activate
lamson stop
lamson start -FORCE True -uid 1001 -gid 1001

Note that the uid and gid values should be the user and group ID of the user account mailserver. You can check those values using:

id mailserver

Make the startup script executable:

chmod og+x start

Create a few required directories:

mkdir logs
mkdir run

The startup script must be executed as a root (if you are listening to port 25):

sudo ./start

You could add the script to root's crontab to start the server after every boot.

Copyright (c) 2014 Jaakko Luttinen

MIT License