You can't. I'd like to report that whitelisting as described in the release notes for SP2 will avoid the issue, but it's never had any effect in my testing. I haven't tested it in about 6 months so you might want to give it a try just in case. I generally advise internal mail generators use another identity in the SMTP virtual server which doesn't have the IMF applied. ("another identity" means alternate/secondary IP address or different port.) Carl _____ From: exchangelist-bounce@xxxxxxxxxxxxx [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Bruce J. Rose Sent: Friday, April 21, 2006 4:04 PM To: exchangelist@xxxxxxxxxxxxx Subject: [ExchangeList] IMF SCL rating I am using blat to generate alert emails, the emails contain only simple text about temperature in my Transmitter shacks. The IMF filter sees them as 7.8 on the SCL. Any ideas on how to lower the SCL rating? Thanks bruce