One way to keep your subscribers happy is to regularly clean your list by removing inactive contacts. Inactive recipients are those who haven’t opened or clicked your email marketing campaigns in a given amount of time, like the last six months. But before removing those inactive subscribers, make sure they really don’t want to keep receiving your communications and, most importantly, try to reconnect one last time. This is where re-engagement email campaigns come in.

Even if subscribers can show less interest in your emails over time, sending win-back email campaigns is a great technique to help renew the relationship. A re-engagement email is your last effort to remind inactive contacts of the value and benefits your campaigns bring to them. Also, as this is your last chance to grab their attention, you should try a creative and fun approach for your subject line. For example, use a “We miss you” subject line. But if your last attempt to make contact again doesn’t work, you have to let recipients that are not interested anymore go.
To send a re-engagement campaign, make sure to use an Email Service Provider that offers advanced statistics and segmentation, and then:
Result
While marketers lose about 25% of their email list each year, sending a re-engagement campaign helps retain subscribers over time.