Let’s say the recipient is considering unsubscribing. He or she may be too busy to search through the email to find the unsubscribe link, so he or she just clicks “Report as SPAM” to stop the emails from coming. This is the last thing any marketer wants to see happen. It negatively impacts sender reputation, requiring extra work to improve email deliverability. With the list-unsubscribe header, you will avoid getting into this kind of trouble in the first place.

There are so many features like personalization, unsubscribe links and social networking widgets that will make sure your emails are more likely to fall into your prospects' inbox.

Preheat your sending accounts and IP to improve your inboxt rate be over 90%

Email’s actually not guaranteed to be quick. Even though it usually is pretty darned speedy, the entire email system is built to tolerate delays of several days. There are various reasons that this might happen, including a few very legitimate spam-fighting techniques. The solution? Wait a while. If in a few hours or the next day you still haven’t received the confirmation email, the problem may be elsewhere.