unprocessed?

Hi, We run aprox. 600 mailinglists using smartlist. Now occasionally we have the problem that if someone sends a short html e-mail message, they get returned with an "unprocessed" x-diagnostic. What can I do to fix this problem? Folkert van Heusden -- Temperature outside: 23.125000, temperature livingroom: 22.2 ---------------------------------------------------------------------- Phone: +31-6-41278122, PGP-key: 1F28D8AE, www.vanheusden.com