Bounced emails cost $5 billion a year
Bounced emails cost their senders USD 5 billion a year, according to a report from the gateway security company IronPort 
.
The company studied global email traffic and concluded that only 20% of emails are legitimate. Spam makes up 67% of email and bounced emails account for 9%. Viruses infect 3% of email messages worldwide and phishing attacks are less than 1 percent.
Direct Marketing site DMNews reports that “Patrick Peterson, IronPort’s chief technology officer, said he was “shocked” when he first heard about the cost of bounced messages.”
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