Bogofilter and offlineimap?

[Dominique Orban]

Hello,

I'd like to ask if anyone out there has a working setup where 
bogofilter filters mail sync from an IMAP server by way of offlineimap. It
seems the web doesn't have such an example.

I'm not running a mail server. I have a simple single-user setup where several
distant IMAP accounts are synced locally with offlineimap. When offlineimap
fetches new messages, they end up in ~/Mail/Account1/INBOX/new. In my
~/.offlineimaprc, I set a post-sync hook like so

    postsynchook = ~/bin/process-new-mail Account1 ~/Mail/Account1

Here, `process-new-mail` is a bash script that simply runs two functions. The
first function counts the number of new messages and displays a notification.
The second function is supposed to run bogofilter on each message (the server's
spam filter is insufficient and I don't have control over it). This is
where I'm having difficulties. The function looks like this:

    check_spam() {
      # Protect against paths with white space
      SAVEIFS=$IFS
      IFS=$(echo -en "\n\b");
      new=$(find $2/INBOX/new -type f)
      for f in $new
      do
        bogofilter -u -p -I $f -O $2/INBOX-processed/new/$(basename $f)
        ham=$?
        syslog -s -l error "bogofilter return value: $ham"
        # Here, could filter according to value of `ham`.
      done
      IFS=$SAVEIFS
    }

The function doesn't even separate the spam from the ham. All I'd like at first
is for bogofilter to add the `X-bogosity` field to the e-mail header.

It works when I run ~/bin/process-new-mail by hand. But not when it's run as
offlineimap's post-sync hook. The output file is never created. I tried the
alternative

    cat $f | bogofilter -u -p > $2/INBOX-processed/new/$(basename $f)

but in that case the file created is 0 bytes long.

I use mutt to read messages, if that matters at all.

I thought a possible problem might be that offlineimap is multi-threaded. I've
tried to force it to be single-threaded by setting

    maxsyncaccounts = 1

Offlineimap is run as a periodic system job (using launchctl, I'm on OSX) with
command-line argument `-1` (to enforce single-threadedness).

All help/hints very much appreciated!

Dominique
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