The September 10 Harris-Trump debate caused a bigger drop in Internet traffic across the US than the Biden-Trump debate on June 27, with some states experiencing up to a 25% decline. There was also an increase in DNS traffic to both Kamala Harris-related and Donald Trump-related domains during and after the debate. Additionally, there was a rise in aggregated DNS traffic to general US news sites and election-related websites. From a cybersecurity perspective, Donald Trump remained the candidate with the most mentions in email subjects and the highest percentages of emails classified as spam and malicious.