SMTP AUTH is authentication used by clients to send email through a server. Learn how it works and why it matters for security.
SMTP AUTH is the mechanism email clients use to authenticate with a mail server when submitting outgoing mail. It prevents open relaying and controls who can send through a server.
When SMTP AUTH is misconfigured, accounts can be abused for spam. Strong passwords, MFA where possible, and monitoring unusual sending patterns are key safeguards.