In dividing your list in this manner, you give yourself the ability to send more targeted communication. Some customers want both product and sales updates, while others might only want to hear about new versions. If you don’t give them the chance to choose, you risk losing them all-together. Since customers make the best buyers, it’s fairly obvious why you want to keep them subscribed to your customer email list.
The CAN-SPAM Act of 2003 was passed by Congress as a direct response to the growing number of complaints over spam e-mails. Congress determined that the US government was showing an increased interest in the regulation of commercial electronic mail nationally, that those who send commercial e-mails should not mislead recipients over the source or content of them, and that all recipients of such emails have a right to decline them. The act authorizes a US $16,000 penalty per violation for spamming each individual recipient. However, it does not ban spam emailing outright, but imposes laws on using deceptive marketing methods through headings which are "materially false or misleading". In addition there are conditions which email marketers must meet in terms of their format, their content and labeling. As a result, many commercial email marketers within the United States utilize a service or special software to ensure compliance with the act. A variety of older systems exist that do not ensure compliance with the act. To comply with the act's regulation of commercial email, services also typically require users to authenticate their return address and include a valid physical address, provide a one-click unsubscribe feature, and prohibit importing lists of purchased addresses that may not have given valid permission.
Twitter has Twitter Lead Gen Cards, which let you generate leads directly within a tweet without having to leave the site. A user's name, email address, and Twitter username are automatically pulled into the card, and all they have to do is click "Submit" to become a lead. (Hint for HubSpot users: You can connect Twitter Lead Gen Cards to your HubSpot Forms. Learn how to do that here).