In 2019, over 6 million email address errors were corrected, revealing a significant increase in malformed addresses since 2018, including a 264% rise in multiple typos and a 200% increase in missing symbols. The analysis observed a troubling trend: an average of 4,000 problematic addresses per million subscribers, with disposable emails rising by 187% and frequent complainers increasing by 126%. The data indicates that bad email addresses remain a persistent issue in email marketing, emphasizing the need for better management strategies.