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Re: redirecting bounce messages
On Fri, Aug 12, 2005 at 04:18:16PM -0500, Michael Boudreau wrote:
> On Aug 12, 2005, at 1:41 PM, Alvin Starr wrote:
> > Roy Bixler wrote:
> >> According to the documentation I have available (in the cf/trusted.cf
> >> file), ZMailer by default only trusts "root", "daemon" and "uucp" to
> >> change the apparently originating user. If you want to change the
> >> default, create a "zmailer" group with the above "trusted" users plus
> >> the "nobody" user and re-start ZMailer.
> > I believe that I am saying the same thing but if you have a stock
> > install(mine is from the RPM) in /etc/group there is a zmailer group.
> > Add your nobody to that line and then your cgi can invoke sendmail
> > with the "-f" option. This will mean the the user nobody can send
> > mail from the server as anybody it wants.
> Yes, modifying the zmailer group has made the 'Sender' header
> disappear from the outgoing messages, and I'm no longer seeing the
> bounce messages, which I assume are going back to the original
> senders now.
> However, something new happens when 'nobody' is included in the
> zmailer group. Messages that are sent to special addresses on the
> server, which our crossbar.cf file catches and redirects to a special
> user's account, where procmail takes over, seem to be getting the
> @domain.com part of the address stripped off.
Err... Somewhere in there is a BIG warning, that 'nobody' user should
not be in trusted group. What and why that was, I don't remember
at this time of the night.
You will get nasty surprises, I seem to recall.
> 1. message CC'd to 'ABCemail@example.com'
> 2. crossbar.cf says that anything sent to this address is redirected
> to 'specialuser'
Hacking crossbar.cf for this is not a good idea.
You can do it with fqdnroute mapping. (Or perhaps with fqdnalias
plain and simple.)
> 3. specialuser's procmail script archives a copy of this message, and
> the archived copy has only 'ABC-123' in the CC header.
The main purpose of crossbar.cf is visible header rewriting (e.g.
canonicalize visible headers) which may cause the observed surprise here.
> Should I expect zmailer to be editing email headers, or should I look
> for another culprit?
Yes. You can see what happens, by sending a test message as:
Mail -v test@address
and in most cases it shows all processing in more detail than you
like to see...
> Michael R. Boudreau
> Senior Electronic Publishing Developer
> The University of Chicago Press
> 1427 E. 60th Street
> Chicago, IL 60637
> 773-753-3298 fax: 773 753 3383
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/Matti Aarnio <email@example.com>
FUNET: Finnish Academic and Research Network
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