Kaspersky Secure Mail Gateway

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 must be prevented from receiving messages for non-existent 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 non-existent 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 added to the black list.

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