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IronPort in late July added bounce verification technology to its line of e-mail security appliances to deal with the growing problem of bounce spam attacks.
Bounce spam, one of spammers' latest tactics, involves crafting e-mails that are intentionally designed to be returned, or 'bounced,' in order to reach their intended targets. In a bounce spam attack, the spammer crafts an e-mail with a fake, non-working recipient address and then spoofs the return address to make it look like the message is coming from the intended target....