Basic SMTP Authentication for SMTP Relay

Check Point Email Security now supports Basic SMTP Authentication for SMTP Relay sources, providing more flexible and granular authentication options for outbound mail flows.

Cloud SMTP Relay helps organizations securely send outbound emails from internal systems, applications, and services through Check Point Email Security. The service already supports secure outbound delivery using standard authentication and encryption mechanisms, including SPF, DKIM, DMARC, and TLS.

With this release, SMTP Relay sources can now authenticate using a username and password with Basic SMTP Authentication. This provides administrators with an additional authentication method that can be used alongside dedicated IP authentication or as an alternative when IP-based authentication is not practical.

This is especially useful for cloud-based mail flows, services without static or private IP addresses, and environments where multiple services share the same outbound IP ranges. By allowing each service to authenticate with its own credentials, organizations gain more flexibility, stronger service-level control, and easier separation between applications, services, and relay sources. Basic SMTP Authentication can also be combined with IP-based filtering for an additional layer of access control.

For configuration details, see the published Cloud SMTP Relay documentation.