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python content_filter for Postfix (rewriting the subject)

David Goodwin - Wed, 01/07/2015 - 11:50

A python script which can be used as a Postfix content_filter to headers email going through it … (example shows changing the Subject).

#!/usr/bin/python from email import Parser import smtplib import sys import logging logging.basicConfig(level=logging.DEBUG, format='%(asctime)s %(levelname)s %(message)s', filename='/tmp/content-filter.log', filemode='a') # Get the CLI arguments. try: cli_from = sys.argv[2].lower() cli_to = sys.argv[4:] logging.debug("To / From : %r" % sys.argv) except: logging.error("Invalid to / from : %r" % sys.argv) sys.exit(69) # postfix will bounce the mail. retrying bad args won't work logging.debug("From : %s, to : %r" % (cli_from, cli_to)) # Get the email content from STDIN. content = ''.join(sys.stdin.readlines()) p = Parser.Parser() parsed = p.parsestr(content, True) #logging.debug("email source : %s" % parsed.as_string()) old_subject = parsed.get('Subject'); # remove the old header, and add a new one. del parsed['subject'] parsed['Subject'] = "New Subject -- " + old_subject # convert it back to a big string. content = str(parsed) # and let's try reinjecting it into Postfix. command = ["/usr/sbin/sendmail", "-G", "-i", "-f", cli_from, cli_to] stdout = '' stderr = '' retval = 0 try : process = Popen(command, stdin=PIPE) (stdout, stderr) = process.communicate(content); retval = process.wait() if retval == 0: logging.debug("Mail resent via sendmail, stdout: %s, stderr: %s" % (stdout, stderr)) sys.exit(0) else: raise Exception("retval not zero - %s" % retval) except Exception, e: print "Error re-injecting via /usr/sbin/sendmail." logging.error("Error resending mail %s -- stdout:%s, stderr:%s, retval: %s" % (e, stdout, stderr, retval)) sys.exit(75) # tempfail, we hope.

Personal Service.

Dick Turpin - Fri, 26/06/2015 - 12:56
As some of you may know I had the two big toe toenails removed last week.

Me: "Come and rub my feet will you?"
Engineer: "Fook off will I rub your manky feet!"
Me: "See, this is exactly the attitude I was talking about. Uncooperative and bolshy."
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