As stated in the Postfix Filter Readme, I would like to make a filter for the spawn service, preferably in Python, which I can define in master.cf like this: /etc/postfix/master.cf: # =================================================================== # service type private unpriv chroot wakeup maxproc command # (yes) (yes) (yes) (never) (100) # =================================================================== localhost:10025 inet n n n - 10 spawn user=filter argv=/path/to/filter localhost 10026 So in case the mail is not bounced, it will inject the mail back to Postfix on port 10026. An alternative to the spawn service, is running a standalone smtp daemon, for instance on port 10025. I've found this example that is using Python's smtpd.SMTPServer. That seems to be working OK, but I would prefer the spawn-method because I don't want to manage the daemon myself, like ensuring it is still running correctly. I cannot find that much information about the Postfix spawn service and how I should implement a filter for it. What would be (the format of) the input (commands) for such a filter? Can someone provide an example, preferably in Python? Continue reading...
