Email 2FA: When My OTP Emails Refused to Send (Go + RabbitMQ + Elastic Email)

Oct 30, 2025 · 4 min read · Context: Building the Email 2FA (Two-Factor Authentication) feature for my backend. Stack: Go, GORM, RabbitMQ, Elastic Email. This is me, understanding how everything connects. This is not a tutorial, just real notes from debugging and clarity. Start...