Quote:

Fal: Sorry my q wasn't clear as so often happens. What I meant was, how does the algorithm distinguish between the characteristics of a spam and those of other communiques without inadvertently deleting an occasional instance of the latter



It doesn't. They're called false positives. Hopefully it doesn't delete the messages that it has identified as spam, but puts them in a folder that you can go through regularly. You can then let the email handler know that a specific message is not spam.