I like Yahoo's approach-- they do their disposable email aliases like this: basename-spammerspecificsuffix@yahoo.com Where basename is user-chosen (and not n

I like Yahoo's approach-- they do their disposable email aliases like this: basename-spammerspecificsuffix@yahoo.com Where basename is user-chosen (and not necessarily related to the real email address), and the suffix has to be registered ahead of time (so a spammer can't just start randomly generating suffixes to avoid filters).