Buying an email list is a bad idea. Each business should build its business in time offering some good information and tools and in return ask for an email to where this info would be sent. If people give their email voluntarily, that means they are interested in what you have to say and they would potentially be interested to hear from you again. Don't forget to include Unsubscribe option in your email. If you don't include it, then your email is a spam.
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