Viva.com, one of Europe's largest payment processors, sends verification emails without a Message-ID header — a recommendation of RFC 5322 since 2008. Google Workspace rejects them outright. Their support team's response to my detailed bug report: your account has a verified email, so there's no problem.

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Viva.com, a major European payment processor, sends verification emails without a Message-ID header—a basic RFC 5322 recommendation since 2008. Google Workspace rejects these emails outright, forcing users to switch to personal Gmail addresses. When reported with technical details, support dismissed the issue since the user had worked around it. The incident highlights broader quality issues with European fintech infrastructure compared to alternatives like Stripe, particularly in markets with limited competition and local payment requirements.

Major European Payment Processor Can't Send Email to Google Users

The verification email that never arrived