Why Email Deliverability Matters in Multi-Factor Authentication (MFA) Workflows

Multi-Factor Authentication (MFA) is crucial for digital security, often relying on email to deliver authentication codes or links, but its effectiveness is hampered by issues with email deliverability. Emails must reach users' inboxes promptly to prevent frustration and potential security risks, as delays can lead to users disabling MFA or switching to competitors. Email deliverability is influenced by factors such as sender reputation, authentication protocols like SPF, DKIM, and DMARC, and consistent sending patterns. For new or scaled systems, gradual warming up of email sending volume is essential to build trust with Internet Service Providers (ISPs) and ensure that critical MFA emails are not marked as spam. Monitoring deliverability metrics and using dedicated platforms help maintain reliable email delivery, making it a critical component of a secure app infrastructure.