Magento SMTP vs PHP mail(): Which Should You Use?

Every Magento store sends transactional email, and there are two ways to do it: the built-in PHP mail() transport, or an authenticated SMTP relay. They look similar from the admin, but they behave very differently where it counts — the inbox.

Deliverability

mail() sends unauthenticated mail with no sending reputation, so it is frequently filtered to spam. SMTP relays your mail through a provider with proper authentication and an established reputation, which is what mailbox providers trust. For any store that depends on order confirmations and password resets arriving, this difference alone decides it.

Visibility and recovery

mail() gives you no record of what was sent and no way to resend. A good SMTP layer logs every message, lets you preview the exact email, and resend a single mail or many at once — invaluable when a customer claims they never got their receipt.

When mail() is fine

For a local development environment, or a staging site that should never email real customers, the simplicity of mail() (or a captured mailbox) is fine. For production, authenticated SMTP is the right default.