We have an Exchange 5.5 system linked to our exchange 2000 system by an SMTP
connector. Some external mail users are reporting an intermittant problem
where mail to the Exchange 5.5 users is being rejected with the NDR message
"body type rejected by remote host". External mail is routed to 5.5 by
a mimesweeper box and the Exchange 2000 mail system.
We have already applied Microsoft fix Q262168 to all relavant Exchange 2000