check out the spamassassin manpage for more detail, but spamassassin --remove-addr-from-whitelist is what you need.. wipes a single entry out of the AWL db.
is be calculated on a pre-GTUBE basis specifically to prevent this.
Erk.. my last sentence got mangled in editing...
"is be calculated on a pre-GTUBE basis specifically to prevent this."
should read:
"You really shouldn't be able to cause this problem while experimenting with GTUBE. The AWL is calculated on a pre-GTUBE basis specifically to prevent this."
