1. Specificity: Feedback should be detailed and focused on particular aspects of the email campaign, such as subject lines, content, design, or call-to-action (CTA) effectiveness. 2. Actionability: The feedback should provide clear steps or suggestions on how to improve. Vague feedback like "make it better" is not helpful. 3. Timeliness: Provide feedback as soon as possible so that it can be implemented in the next iteration of the campaign. 4. Constructiveness: Feedback should be positive and aimed at improvement, rather than merely criticizing.