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When you send an e-mail to multiple people and don't hide their e-mail address. Good way for spammers to harvest e-mail addresses. Better practice is to send bcc: when you have a large list.
I hate it when I get a chain e-mail Broadcasting e-mail address to the entire internet world!

Never send e-mails or forwards to a large group. Rather show all individuals as a bcc.
by MsDish September 20, 2011
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