Quick & Easy: Modoboa Self Hosted Email Server with Webmail

Create a Droplet at DigitalOcean (use my link and get a month free or more!)
apt-get update && apt-get install python-minimal git
add droplet ip to mail.yourdomain.com and mail.yourdomain.com to MX record
git clone https://github.com/modoboa/modoboa-installer
cd modoboa-installer && ./run.py mail.yourdomain.com
goto http://mail.yourdomain.com
Edit admin password under admin > Settings
add user@domain.tld as simpleusers in identities
now you can login as user@domain.tld in a private browser session
and try send an email to check-auth@verifier.port25.com to check if its working

not receiving mail?

amavis can hang for some reason if you have little memory etc