Shaun,
I'm not 100% positive, but if memory serves correctly the Result Codes in Message Sniffer are as follows:
0 - Clean
1 - Whitelisted
2 - 63 Match
65-99 Error Code
So a Result Code of 60 would mean that it matched one of the Message Sniffer Rules and would be flagged with the weight you have assigned it in SECURITY > ANTISPAM ADMINISTRATION.