[exim] Batch SMTP hangs

Hi,

I posted this problem a few weeks ago, but received no response, so
I'm reposting it.

I have a perl script that runs as a pipe transport and injects two
e-mails back into the system via BSMTP. Up until a recent upgrade from
Woody to Sarge this all worked fine. Now, when injecting the second
message, my script hangs when closing the file descriptor to exim. The
perl looks something like this:

       open BSMTP , "| /usr/sbin/exim -oMr foo -bS" or die "Unable to
run exim: $!\n";
       print BSMTP "MAIL FROM:<$from>\n";
       print BSMTP "RCPT TO:<$to>\n";
       print BSMTP "DATA\n";

       # print out body

       print BSMTP ".\n";
       close BSMTP;
       die "Exim BSMTP failed, code $?\n" if ($?);

Exim (version 4.51) does accept and queue the message. I've generated
some debug and the last few lines of debug are:

       calling local_scan(); timeout=300
       local_scan() returned 0 NULL
       Writing spool header file
       Size of headers = 334
       LOG: MAIN
         <= <<<log entry>>>
       search_tidyup called
       smtp_setup_msg entered

There would normally be another line
       search_tidyup called
and then the process terminating.

I'm not sure how to continue to debug this, so any advice would be appreciated.

regards,
John