PGP mail filtering/syncing

My PGP key resides on one single machine, which runs no services and is mostly offline. Mail is delivered to another well-connected box. The mailbox format is Maildir. To decrypt mails I need to transfer the stuff to the machine with the key.
My .procmailrc on the connected box:

:0:
* Content-Type: multipart/encrypted;
pgp/

:0 B:
* -----BEGIN PGP MESSAGE-----
pgp/

To sync the files to the secure box, I use rsync. The problem is that my mail reader renames the files in the maildir to store flags like read, replied, so rsync pulls too many files. The following script helps:

tmpfile=`mktemp /tmp/mailsync.XXXXXXXX` || exit 1
for i in `find pgp -type f| sed -e 's/:[RSF,0-9]*$//'`; do
  echo -n "new/" >> $tmpfile
  basename $i >> $tmpfile
done
rsync -zvaubr --exclude-from=$tmpfile mailhost:~/Mail/pgp/ pgp/
rm $tmpfile

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