- Open Rate
- The percentage of delivered emails that recipients open β a primary indicator of subject line effectiveness and sender reputation.
- Click-to-Open Rate (CTOR)
- The percentage of email openers who click at least one link β measures how well the email body converts readers who already opened.
- List Segmentation
- Dividing an email list into smaller groups based on shared attributes β purchase history, engagement level, geography, or lifecycle stage β so each group receives relevant content.
- Send Cadence
- How frequently emails are sent to a list or segment β daily, weekly, biweekly, or monthly β and the day and time of each send.
- Automation Trigger
- A subscriber action or inaction β such as a sign-up, purchase, or 30 days of silence β that automatically initiates a specific email sequence.
- Re-Engagement Sequence
- A series of emails sent to inactive subscribers to prompt renewed interaction before they are removed from the active list.
- Deliverability
- The ability of an email to reach a subscriber's inbox rather than a spam or junk folder, influenced by sender reputation, domain authentication, and list hygiene.
- Churn Rate (Email)
- The percentage of subscribers who unsubscribe or become permanently inactive over a given period β used to measure list health over time.
- Subscriber Lifecycle Stage
- A classification of where a subscriber sits in their relationship with the sender β new, active, at-risk, dormant, or churned β used to determine which content and sequence to send.
- A/B Test
- A controlled experiment that sends two variants of an email β differing in subject line, send time, or content β to split portions of a segment to identify which performs better.