Are you really willing to risk not only your email deliverability, but also the reputation of your IP address and your company? Even if you find the light after purchasing or renting email lists and decide to only email those who have opted in with your company, it'll take you months (or maybe years) to get your Sender Score up and rebuild the reputation of your IP.
Buying email lists aren’t allowed by reputable email marketing services Email marketing services, including Constant Contact, do not allow you to use purchased lists. That’s because we are an email service provider that maintains a strong anti-spam policy to ensure that our customers are only sending emails to people who have expressed interest in receiving them. And that means refraining from buying an email list.
Electronic mail , often abbreviated as email or e-mail , is a method of exchanging digital messages, designed primarily for human use.. An electronic mail message consists of two components, the message header , and the message body , which is the email's content. The message header contains control information, including, minimally, an originator's email address and one or more recipient addresses. Usually additional information is added, such as a subject header field.. E-mail systems are based on a store-and-forward model in which e-mail computer server systems accept, forward, deliver and store messages on behalf of users, who only need to connect to the e-mail infrastructure, typically an e-mail server, with a network-enabled device (e.g., a personal computer) for the duration of message submission or retrieval. Rarely is e-mail transmitted directly from one user's device to another's. Wikipedia
Be aware from January the popup opt in is going to decimate your Google search rankings, so the evergreen welcome mat and overlay (which you’re using on this page on exit intent) are going to be things of the past (unless you want to lose your position in the SERPS…). Time to get rid of the popups now and move to content upgrades inline in your articles (which you do really well in this post!). 

It's practically impossible to overstate the importance of direct mailing lists to the success of your direct mail program. The correct mailing list will contain your most valuable prospects. The more careful you are in analyzing and selecting direct mailing lists, the better your chances for success. There are several different categories of mailing lists available on the market today ranging in cost and appropriateness for your market. When you are considering what type of mailing list to buy consider the following three types: 
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