Due to the massive growth of the Internet, most countries have passed legislation to prevent companies from sending unsolicited emails. These laws determine what is and what is not considered acceptable email correspondence, and enforce restrictions on email communications. In the United States and Europe, for example, bulk email must contain an accurate from field and subject line, and the email content must include the sender’s physical address. In addition, a blast email must also offer its recipients the opportunity to unsubscribe from the email list — and such requests must be met within a specified period of time. As a result of these laws, it is very important for companies to maintain an updated list of subscriptions and cancellations at all times, and avoid sending out email that appears to be spam. https://mangools.com/blog/wp-content/uploads/2017/11/Case-study-Launching-a-new-product-email-campaign-960x510.png
"Constant Contact makes it easy to create as many contact lists as we need. I can add an email address to multiple lists at once, or a reader can subscribe to several email lists. This allows us to send targeted emails. Sending people only the emails they want makes readers happier, increases open rates, and makes my email marketing efforts—and my time—more effective."
When you send messages to a purchased email list, you don’t have explicit opt-in to be emailing those subscribers. Explicit opt-in — meaning subscribers actively and knowingly gave you permission to email them (i.e. filling out a sign up form on your website) — is required for a quality list, says AWeber’s Best Practices Manager, Josh Smith. “If you don’t have explicit opt-in, you are bound to have problems,” he explains.
Four months later, Laurence Canter and Martha Siegel, partners in a law firm, broadly promoted their legal services in a USENET posting titled "Green Card Lottery – Final One?"[15] Canter and Siegel's Green Card USENET spam raised the profile of online advertising, stimulating widespread interest in advertising via both Usenet and traditional email.[12] More recently, spam has evolved into a more industrial operation, where spammers use armies of virus-infected computers (botnets) to send spam remotely.[10]
Particular groups of customers can be targeted or even individuals. Offering individual customers special deals on merchandise and/or services on the customer's birthday, for instance, is one example of email marketing personalization. (A restaurant might send an email to customers on their birthday offering 50% off an entree,) Email marketing helps a business develop and maintain a relationship with a customer over time that hopefully results in increased sales and increased customer loyalty. 
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