Email verification looks simple on the surface, but in practice it fails more often than many teams expect.

From what I have seen, most issues are not caused by the email service itself, but by how verification systems are designed and tested.

Common failure points:

• Domains that are silently blocked

• Messages delayed just long enough to expire

• OTP codes with very short lifetimes

• Rate limits that are easy to hit during retries

• Users refreshing or resubmitting forms too quickly

People often compare temporary email and email aliases as if one is better than the other.

In reality, the choice depends on the product you are building.

Temporary email is optimized for low commitment. It works well for:

• quick access

• one-time confirmations

• low-risk signups

• testing flows without long-term storage