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I need a very simple daemon script that receives all emails to a domain name and just forwards them to a script. I know there's software like exim, qmail or others to do this, but I do not want to install big software that eats performance in the host.

I have the MX record of the domain pointing to the host; now I need some daemon listening on port 25 and answering correctly to the mail standard communications (HELO and that stuff), and then handing the mail to a script.

How can I do that?

Edit: the domain.com will JUST be incoming, I don't need that domain to have POP accounts, or send emails; the domain will just receive emails addressed to *@domain.com, and I would like all of them to be redirected to a script.

I would like it in C or Perl if possible

share|improve this question
possible duplicate of Lightweight outgoing SMTP server – Gilles Apr 17 '11 at 22:22
Do you have any code? – matcheek Apr 18 '11 at 1:02
No, i don't want outgoing , i want incoming !!! – user6686 Apr 18 '11 at 5:38

The Python standard library include the smtpd module which implements the smtp server protocol. You should be able to do what you want with a few lines of python.

Here is some sample code to start from:

import smtpd
import asyncore

class CustomSMTPServer(smtpd.SMTPServer):

    def process_message(self, peer, mailfrom, rcpttos, data):
        print 'Receiving message from:', peer
        print 'Message addressed from:', mailfrom
        print 'Message addressed to  :', rcpttos
        print 'Message length        :', len(data)

server = CustomSMTPServer(('', 25), None)

share|improve this answer
Thank you but I do not know python :( – user6686 Apr 19 '11 at 5:02
If you know C and Perl, Python should be the easiest language to learn. Probably there is only one line missing to finish this script. How should the mail be redirected to your script ? What to do with the recipients and the body of the message ? – philfr Apr 19 '11 at 7:59

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