Hehe, it's OK.
It is peculiar, the behavior...I have 6/7 SME servers around and only a few behave consistently (in the same manner), an issue I discovered is with whitelisting (globally), some servers will act upon it and don't let in any or hardly any spam, and with others is just like there is no whitelist at all, but this is another story altogether...digressing here...
regards again
Gianni