Skipping Testing: Not testing emails can lead to undetected errors and poor performance. Ignoring Mobile Optimization: Failing to optimize for mobile can result in a negative user experience for a large portion of your audience. Overlooking Compliance: Neglecting legal requirements can lead to fines and damage to your reputation. Not Personalizing: Sending generic emails can reduce engagement and effectiveness. Bad Timing: Sending emails at the wrong time can impact open rates and engagement.