Unengaged subscriberA subscriber who has not interacted with a sender's email campaigns over a period of time, indicating decreased interest or disengagement.
Unengaged subscriber re-engagementThe process of attempting to re-engage subscribers who have not interacted with email campaigns for an extended period of time, through targeted and personalized campaigns.
UnsubscribeThe process of removing oneself from an email list and no longer receiving email campaigns from the sender.
Unsubscribe rateThe percentage of subscribers who opt-out or unsubscribe from an email list after receiving a campaign.
Upselling emailAn automated email that promotes higher-end or upgraded versions of a product or service, encouraging subscribers to upgrade their purchase.
User-generated content (UGC)Content created by customers or followers of a brand, such as reviews, social media posts, or testimonials, that can be used in email campaigns to increase engagement and credibility.