There are various tools and techniques available to perform cross client testing effectively:
Manual Testing: This involves sending test emails to multiple accounts on different email clients. While this method is time-consuming, it allows you to see exactly how your email will appear. Automated Tools: Tools like Litmus, Email on Acid, and Mailtrap provide screenshots and analytics of how your emails render across various clients and devices. These tools are more efficient and provide a comprehensive overview. Code Validation: Ensuring your HTML and CSS are optimized for email clients can reduce rendering issues. Tools like the W3C Validator can help identify problematic code.