Mac Mail & Multiple Email Accounts

I have SpamSieve working fine on my main (dotMac / MobileMe) account, but I want it to catch spam in my GMail account as well.

Do I need to change the rule to achieve this or is it simply that GMail is catching the spam and moving it before SpamSieve gets to see it?

If you’re using Apple Mail and your SpamSieve rule is at the top of the list, there’s nothing else you need to do. SpamSieve will catch Gmail spam that arrives in the inbox and that has not already been caught by Google’s filter.