I have now switched to a different email app (ESP) and am now using a double opt-in system on the website. I am reluctant to add bad email addresses into the new email app.
How can I effectively use this email address list to communicate with prospects? Is there a way to use social media to connect with prospects from this list? (For most records, I have first name, email address, and IP address; for a smaller subset I have additional information like city, state, zip code etc.)