A Swedish gaming platform with 12 million active users across 190 countries was experiencing significant account compromise events traced to failed two-factor authentication email delivery. Security team data showed that 31% of account compromise events were preceded by a failed 2FA email delivery.
The platform was sending all email — 2FA codes, purchase confirmations, promotional events, and notifications — from a single sending stream. Promotional gaming event emails generated complaint rates of 0.18%, which degraded the IP reputation used for security-critical 2FA codes. In Southeast Asia and Latin America, delivery rates were below 60%.
SolutionWe deployed a priority-tiered architecture: Tier 1 (security email: 2FA, password reset) on dedicated IPs with highest priority and aggressive retry logic; Tier 2 (purchase confirmations); Tier 3 (promotional) on isolated IPs. Regional infrastructure was added for Southeast Asia and Latin America.
Results"We had a security problem disguised as an email problem. When 2FA codes don't arrive, players use workarounds that expose their accounts. The infrastructure change was directly measurable in our security metrics."
— Head of Security Engineering, Gaming PlatformGaming platforms send email across fundamentally different urgency tiers: security-critical and engagement-optional. Mixing these in a single stream means promotional reputation degradation directly reduces security email reliability. Priority-tiered infrastructure with complete stream isolation is the only correct architecture.
