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SPAM
Email spamming is the use of electronic messaging to send unsolicited messages (spam), especially advertising, as well as sending messages repeatedly on the same site.
How to report SPAM?
To report Spam in Gmail, select the email, then click "Spam" from the upper menu. Google will "learn" that you will no longer wish to get emails from this email address as well as protect you from future similar Spam emails. Screen shots for example are posted below.
If you moved an item to SPAM in error, you can browse to your Gmail SPAM label and retrieve it up to 30 days.