Source: https://uptimeify.io/resources/platform-and-support/glossary/smtp

# SMTP

> SMTP (Simple Mail Transfer Protocol) is the protocol mail servers use to send and relay outgoing email.

If your SMTP server is down or misconfigured, outgoing mail, receipts, password resets, alerts, silently stops. SMTP monitoring verifies the server accepts connections and responds correctly, catching delivery problems before customers notice.