That only works for spamming 'robots' - computers that are setup to send out spam messages and create accounts automatically. Doesn't work if an actual person signs in. I've been a moderator on a couple of lists where new members were 'moderated', meaning that one of the moderators had to read and approve their messages before they were posted to the list. It works, but can be a bit draconian depending on the moderators, and can be very time intensive...
Mike.
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Same experience here, and these spam posters do seem to be remotely human, so you'll need coverage from enough moderators in a set of time zones. Come to think of it, a couple of former Rob Galbraith moderators can be relied upon to enthusiastically delete such posts....