At least 463,546 malicious URLs contained in the 28.4 million analyzed emails made it through to corporate in-boxes in Q4 of 2018. That averages out to one malicious URL in every 61 emails. The lines between email and web security are blurring, Mimecast’s latest Email Security Risk Assessment (ESRA) report says. The report also found that 24.9 million spam emails, 26,713 malware attachments, 53,753 impersonation attacks and 23,872 dangerous file types.
Source: https://threatpost.com/malicious-emailed-urls-triple-digit-increase/142324/