I am new to SIEVE scripts and am running a Kerio MailServer which utilizes them. I am impressed with the capabilities, however, I have not been able to get a straight answer on whether you can filter the message rules based on the message body. I have several users who wish to sort their mail according to content that is only differentiated based on the message body content. Please point me in the direction of where I can get the answer to this question (RFC?) and if it can be done, what the syntax is.