How to setup a mail server?

Question

I want anyone who send a email to test@example.com, and the server could get the mail and so I can use some server side scripting language like Ruby to parser the content of the

Answer 1

You can install qmail on your server, and configure it to pipe incoming mail to your domain to the STDIN of your ruby script.

If you haven't done so already, create an MX record for your domain that points to your mailserver's IP. Then, login to the server as root, then install qmail by following the instructions at http://lifewithqmail.org/lwq.html#installation

Configure qmail to accept incoming mail for *@yourdomain.tld (catchall), and forward all incoming mail to the script at /home/yourhomedirectory/yourscript.sc:

add the following line to /var/qmail/control/me:
hostname.yourdomain.tld

add the following line to /var/qmail/control/defaultdomain: 
yourdomain.tld

affffd the following line to /var/qmail/control/virtualdomains
yourdomain.tld:yourusername

add the following line to /var/qmail/control/rcphosts:  
yourdomain.tld

restart qmail:
qmailctl stop
qmailctl stat

Logout of the server, then log back in again as yourusername. Create a file /home/yourusername/.qmail-default, consisting of the following line: | /home/yourhomedirectory/yourscript.sc

Create /home/yourhomedirectory/yourscript.sc script to process incoming mail. Enable executable permissions on the script for all users: chmod a+x /home/yourhomedirectory/yourscript.sc

That's all there is to it. Incoming mail to your domain will be piped by qmail to this script's STDIN.