Historically, it has been difficult to measure the effectiveness of marketing campaigns because target markets cannot be adequately defined. Email marketing carries the benefit of allowing marketers to identify returns on investment and measure and improve efficiency.[citation needed] Email marketing allows marketers to see feedback from users in real time, and to monitor how effective their campaign is in achieving market penetration, revealing a communication channel's scope. At the same time, however, it also means that the more personal nature of certain advertising methods, such as television advertisements, cannot be captured.

Last but absolutely not least – Aweber, GetResponse and Vertical Response all have solid Privacy and Anti-Spam Policies in place that are 100% trustworthy as of Dec 2016 at last check. All companies change their policies though so always check the final print (toward the bottom) and make sure you know exactly what you and your clients have “Opted In” for.
There are lots of ways to buy an email list, but none of them will actually benefit your campaign. Why? Since the owners of these email addresses didn't explicitly agree to receive content from you, there's no telling how interested they are -- or if they're even a fit for what you have to offer. A bought email list is also in violation of GDPR (we'll talk more about this in just a minute).
I’m not happy at all with MailChimp. Has anyone found the same problems with MailChimp as I have? I find that many of my list members unsubscribe from my list daily. I know these people ands contact them and they say they have not unsubscribed. twice I even found my own email taken off the list. When I look into the MailChimp list Spam is the reason for the person’s unsubscription. Over the years I’ve been on MailChimp I’ve contacted support and I’ve done everything I can but nothing has changed. I’m now looking to move to another company.
Drip offers a very small forever free plan, along with a two-week free trial for the Basic and Pro membership levels. If you choose to continue service after those two weeks, then your card will be charged. There is a 30-day refund window from when you start your service, but it’s up to the discretion of Drip whether you will receive a full refund. 
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