There are several aspects that need to be tested in an email marketing campaign:
Subject Lines: Test different subject lines to see which one garners the highest open rates. Email Content: Ensure that the content is engaging, error-free, and displays correctly across different devices and email clients. Links: Verify that all links are functional and lead to the correct destinations. Personalization: Check that any personalized elements (e.g., names, personalized offers) are correctly implemented. Spam Filters: Test to ensure your email does not get flagged as spam. Call-to-Action (CTA): Experiment with different CTAs to identify which ones drive the most conversions.