Alas, ESPs on shared IP addresses that don't require customers to use opt-in email lists typically suffer poor deliverability. Why? One customer's ill-gotten email address list can poison the deliverability of the other customers on that shared IP address. You're going to want to hitch your wagon to the light side of the email marketing force if you want your emails to actually get into inboxes.
According to recent research from Radicati Group, worldwide email volume will reach 207 billion messages this year—more than half of those for business. The typical business user receives well over 100 emails each day. Email marketers are challenged not only to make their messages stand out in that deluge, but also to provide relevant, actionable information to targeted recipients.
A tracking pixel is a snippet of code that allows you to track your subscribers’ activity across various channels like your website, landing pages, and newsletters. Then, you also have the option to send emails triggered by certain behaviors. So for example, if a subscriber goes to your site and checks out your product page, a tracking pixel can send an email with a special offer for the specific product the viewed.