About SMTP verification of recipient email addresses

SMTP verification of recipient email addresses – verification performed to check if email addresses of message recipients actually exist.

When Kaspersky Secure Mail Gateway receives messages for secure domains and redirects them to a back-end mail server, Kaspersky Secure Mail Gateway has to be prevented from receiving messages for nonexistent email addresses. This is required for two reasons:

• Receiving messages to be sent to nonexistent email addresses loads the processor because mail is processed unnecessarily.
• Attempts to deliver messages to nonexistent email addresses can cause Kaspersky Secure Mail Gateway or the back-end server to create delivery failure notifications; because of such notifications, Kaspersky Secure Mail Gateway or your back-end mail server will be blacklisted.

Authentication of message recipients is not performed when Kaspersky Secure Mail Gateway receives messages from trusted network nodes.

See also SMTP verification of recipient email addresses Enabling and disabling SMTP verification of recipient email addresses

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