Frustration with postfix and sending email to a script

I want to set up an email address that executes a script with every incoming email, so in my /etc/aliases, I did this:

runscript: |/usr/local/bin/email_reading_script.py

Then I rebuilt the postfix alias db with sudo postalias /etc/aliases, and then sent an email to runscript@localhost. That’s when the fun began. The script is run by nobody/nogroup, so it couldn’t log to my logging directory, because I require people to be in the adm unix group.

Then I created a user named runscript, and moved that | /usr/local/bin/email_reading_script.py line into a .forward file. I added adm to runscript’s unix groups.

AND STILL NO JOY.

I don’t know why, but when the script runs, the shell only seems to get the primary group. So, I kept getting permission-denied errors. I finally got stuff to work when I set adm to be the primary group for my runscript user. Now everything is OK.

This ate up the better part of the @#$@#$ing day. Grr.

If this didn’t work, I was going to install procmail and go down that route.

Am using ubuntu hardy heron.

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matt

My name is Matt Wilson and I live in Cleveland Heights, Ohio. I love random emails from strangers, so get in touch! matt@tplus1.com.

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  • Line

    I think it's because your alias is not the unix user. The script is run by postfix, whose default user is 'nobody'.
    Try to write a file in /tmp with your script, and check the actual unix user that was used.
    I think the default postfix user can be changed in /etc/postfix/master.cf

  • http://blog.tplus1.com Matt Wilson

    Thanks for the tip!