Brainstorm Email Marketing Campaign Ideas

Act as an Email Marketing Specialist. Brainstorm ideas for an email marketing campaign focused on [Campaign Goal] (e.g., nurturing new subscribers, promoting a seasonal sale, re-engaging inactive users).
- **Target Audience Segment:** [e.g., New trial users, long-term customers, specific industry segment]
- **Key Product/Service/Offer:** [Mention what you are ultimately promoting or focusing on]
Suggest a sequence of 3-5 emails. For each email, propose:
1.  A potential subject line concept.
2.  The core message or angle.
3.  A possible call-to-action.