- One-Time Promotions: If you're running a one-time sale or promotion, a single email might suffice to inform your audience. - Event Announcements: Sometimes, an event announcement may not require additional reminders. - Legal Constraints: In certain jurisdictions, strict laws govern email marketing practices, making follow-ups risky. - Audience Preferences: Some subscribers may prefer not to receive multiple emails, and respecting their preferences helps maintain a healthy relationship.