I have a pretty usual requirement with procmail but I am unable to get the results somehow. I have procmailrc file with this content:
:0
* ^To.*@myhost
| /usr/bi
The log excerpt clearly states that your script is executed, even if it doesn't show the desired effect. I'd expect procmail to log an error if the execution failed.
Anyway, make sure that the user (uid) that procmail is executed with has the correct permissions to execute your script. Wire the script into procmail only if you succeeded testing with something like this (replace 'procmail' with the correct uid):
# sudo -u procmail /bin/sh -c '/bin/cat /work/scripts/mail.txt | /usr/bin/python /work/scripts/privilege_emails_forward.py'
Depending on your sudo configuration, you'd have to run this as root. Oh, and make sure you use absolute file paths.