Django snippets: SMTP sink server

SMTP sink server

from datetime import datetime
import asyncore
from smtpd import SMTPServer

class EmlServer(SMTPServer):
    no = 0
    def process_message(self, peer, mailfrom, rcpttos, data):
        filename = '%s-%d.eml' % (datetime.now().strftime('%Y%m%d%H%M%S'),
                self.no)
        f = open(filename, 'w')
        f.write(data)
        f.close
        print '%s saved.' % filename
        self.no += 1


def run():
    foo = EmlServer(('localhost', 25), None)
    try:
        asyncore.loop()
    except KeyboardInterrupt:
        pass


if __name__ == '__main__':
	run()

In development, we need a SMTP Server to see the results of send mail via SMTP protocol in Python application. Instead of configure a mail daemon, we could use this little script to receive the SMTP request, and save each session into an EML file. *.eml could be viewed with your favorite email client, you need not send them out.

EML description

Update: Fix bug for overwrite files when received multi-message in one SMTP session.

Author:: twinsant
Posted:: March 9, 2007
Language:: Python
Tags:: debug email eml server smtp
Score:: 33 (after 33 ratings)

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mboersma (on March 12, 2007):

I'm using this to test ubernostrum's great django-registration package from http://code.google.com/p/django-registration/ and it's been quite helpful while I'm tweaking the registration messages and confirmations. Thanks!

twinsant (on March 20, 2007):

I'm so happy to learn that it's helpful to you:)

Note: This sinppet has been fixed for bug overwriting files when received multi-messages in on session.

zgoda (on July 13, 2007):

This snippet requires running it from root account. You have to add some code to bind to a port number over 1024. Like in line 17 and 18:

def run(port=25):
    foo = EmlServer(('localhost', port), None)

and later in line 26 and later:

try:
    port = int(sys.argv[1])
except IndexError:
    sys.exit("Usage: smtpsink.py <port>")
run(port)

Of course, you have to import sys at the top of the module too.

twinsant (on August 1, 2007):

I found another one: SMTP Mailsink

http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/440690

arne (on August 27, 2007):

very useful, thanks for sharing this snippet

vung (on December 23, 2007):

Line 12 should be: f.close()

zero (on February 12, 2008):

instead of writing an .eml you can directly send your mail to the built in python mail server. on a shell do:

sudo /usr/lib/python2.4/smtpd.py -n -c DebuggingServer localhost:25

then send your mails to localhost:25 and you will see the results immediately :-)

hasenj (on September 21, 2008):

thank you man, this is awesome!! helps so much!

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SMTP sink server

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