Some folks find flattery in imitation, but spam fighters are finding it in denial-of-service attacks. The attacks are being generated by a nasty but undistinguished virus called Mimail-L, which, as part of its mischief, is commandeering its victims’ computers to deluge with e-mail eight prominent antispam sites. The targeted sites include Spamhaus.org, SpamCop.net and SPEWS.org…