Sending mail via sendmail from python

Question

If I want to send mail not via SMTP, but rather via sendmail, is there a library for python that encapsulates this process?

Better yet, is there a good library that abstracts the whole 'sendmail -versus- smtp' choice?

I'll be running this script on a bunch of unix hosts, only some of which are listening on localhost:25; a few of these are part of embedded systems and can't be set up to accept SMTP.

As part of Good Practice, I'd really like to have the library take care of header injection vulnerabilities itself -- so just dumping a string to popen('/usr/bin/sendmail', 'w') is a little closer to the metal than I'd like.

If the answer is 'go write a library,' so be it ;-)

Answer 1

Header injection isn't a factor in how you send the mail, it's a factor in how you construct the mail. Check the email package, construct the mail with that, serialise it, and send it to /usr/sbin/sendmail using the subprocess module:

import sys from email.mime.text import MIMEText from subprocess import Popen, PIPE   msg = MIMEText("Here is the body of my message") msg["From"] = "[email protected]" msg["To"] = "[email protected]" msg["Subject"] = "This is the subject." p = Popen(["/usr/sbin/sendmail", "-t", "-oi"], stdin=PIPE) # Both Python 2.X and 3.X p.communicate(msg.as_bytes() if sys.version_info >= (3,0) else msg.as_string())   # Python 2.X p.communicate(msg.as_string())  # Python 3.X p.communicate(msg.as_bytes()) 

Answer 2

This is a simple python function that uses the unix sendmail to deliver a mail.

def sendMail():     sendmail_location = "/usr/sbin/sendmail" # sendmail location     p = os.popen("%s -t" % sendmail_location, "w")     p.write("From: %s\n" % "[email protected]")     p.write("To: %s\n" % "[email protected]")     p.write("Subject: thesubject\n")     p.write("\n") # blank line separating headers from body     p.write("body of the mail")     status = p.close()     if status != 0:            print "Sendmail exit status", status