A major European payment processor, Viva.com, is unable to send verification emails to Google Workspace users due to a missing Message-ID header, which is a requirement of the Internet Message Format specification (RFC 5322). The issue was discovered when the author tried to create an account on Viva.com and the verification email never arrived. The company's support team responded by stating that the issue was not a problem since the author's account had a verified email address. The author argues that this is a significant issue, as it raises questions about the company's attention to detail and ability to follow industry standards.