A little bird told me that if I enable my exchange 5.5 server to do a reverse MX lookup, that it would cut out a significant amount of SPAM email. Is this true? If so - what do I have to do to enable that in Exchange 5.5? Also - does anyone have any experience with MailMarshal spam filtering software that they would like to share? _Brian Welch MCSE, MCSA Pipkins, Inc. brianw@xxxxxxxxxxx 314-469-6106