Spam is usually considered to be electronic junk mail or junk newsgroup postings. Some people define spam even more generally as any unsolicited email. However, if a long lost brother finds your email address and sends you a message, this could hardly be called spam, even though it is unsolicited. Real spam is generally email advertising for some product sent to a mailing list or newsgroup.The term spam can also be used to describe any unwanted email from a company or website (at some point a user would have agreed to receive the email via subscription list).
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You can reduce the spam rate of your email marketing campaigns by optimizing your database with first and last name. Also, it is important you have email owner permission to send the information. Buying or renting email database is illegal and could result in serious blocking from internet providers.