Re: [SPAM] Some messages fail delivery in postfix -> maildrop -> crm114 chain

Sam Varshavchik <[email protected]> Mon, 06 Jan 2014 20:18:39 -0500
Newsgroups	gmane.mail.maildrop
Message-ID	<[email protected]>
glen martin writes:

>
> On 01/06/14 04:00, Sam Varshavchik wrote:
> > glen martin writes:
> >
> >> Here is my ~/.mailfilter:
> >>
> >>    <snip>
> >>    MAILDIR="$HOME/.maildir"
> >>    DEFAULT="$MAILDIR"
> >>
> >>    logfile "maildropfilter.log"
> >>    log "=========="
> >>
> >>    xfilter "/usr/bin/crm114 -u $HOME/.crm114/
> >> $HOME/.crm114/mailfilter.crm"
> >>
> >>    log "----------"
> >>
> >>    if (/^X-CRM114-Status: SPAM/)
> >>            to "$MAILDIR/.0_checkspam._R_spam"
> >>
> >>    </snip>
> >>
> >> The immediate symptom is that the some messages sit spooled forever
> >> (until they expire, I suppose).  mailq gives me a whole bunch of
> >> items that look like this:
> >>
> >>    <snip>
> >>    51EE7520BA     1981 Sat Jan  4 11:27:34  MAILER-DAEMON
> >>    (temporary failure. Command output: /usr/bin/maildrop: Unable to
> >> filter
> >>    message.)
> >
> > This usually indicates that the external command invoked via xfilter
> > has terminated with a non-zero exit code, indicating an error.
>
> Hi Sam, Thanks for your response.
>
> That was my suspicion as well.  To test that, I've tried calling the
> maildrop command from the shell, in both delivery mode and not, piping
> the same message content. In essence, trying my best to duplicate how
> postfix would have called.  The return code was 0 in those tests, the
> message was delivered successfully both ways. You'll see details farther
> down in my original message.
>
> Is there a way to catch the return code and log information from
> maildrop when it is called from postfix in delivery mode?

Unfortunately this is not logged with enough detail.

But merely invoking something from the command line would not reproduce this  
with 100% accuracy. You would have to invoke maildrop by whatever userid and  
groupid maildrop gets invoked by, from postfix. Additionally, all the  
variables in the environment must be accurately reproduced.

But you can also attack this from another angle. Instead of invoking your  
external filter, from maildrop, have maildrop execute a wrapper shell  
script, that invokes your external filter, and then logs its exit code,  
somewhere.

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