sudo apt-get install -y exim4
sudo service exim4 start
sudo dpkg-reconfigure exim4-config
Configure mail as appropriate for your site and IT infrastructure. We outline a sample standalone configuration below. The requirement is for php to be able to send mail (registration confirmation and other notices need to go out) and for exim4 to receive mail (for support ticket and forum email gateway functions to work).
This is just an example of a standalone mail configuration.
General type of mail configurationinternet site; mail is sent and received directly using SMTP
Mail nameenter the fully qualified domain name (FQDN) of the host (example.com)
IP-addresses to listen on for incoming SMTP connectionsleave blank (listen for connections on all available network interfaces)
Other destinations for which mail is acceptedleave blank or (equivalently) with local hostname (all local domains will be treated identically)
Domains to relay mail forleave blank
Machines to relay mail forleave blank
Keep number of DNS-queries minimal (Dial-on-Demand)No
Delivery method for local mailmbox format in /var/mail/
Split configuration into small files?Yes
Use a real email address below so you can see if you get the email
sudo Mail -v email@example.com