spamassassin setup with Evo - Edgy

[John Dangler]

I have been putting spam mails into a folder called 'Possible_Spam' for
the last hour or so (it has 65 messages in it now), and have run
sa-learn --spam --mbox ./Possible_Spam against it... once the messages
in the folder have been run through sa-learn, do I need to leave them
there, or is it okay to delete them ? (I'm not sure I can see the reason
for running sa-learn multiple times against the same messages) ...