Important note about SSL VPN compatibility for 20.0 MR1 with EoL SFOS versions and UTM9 OS. Learn more in the release notes.

XG MTA to Office 365 Connector “Empty Certificate”

I’m trying to move Office 365 connector authentication from IP-address to certificate. A Let’s Encrypt certificate has been created (on SFOS 21) and added to the SMTP TLS configuration under the Email > General tab. When changing the Office 365 connector to certificate, outgoing email on the XG are bounced with the error message “550 5.7.64 TennantAttribution; Relay Access Denied [ValidationStatus of “ is EmptyCertificate]”. According to Office 365 support articles this is due to “The certificate was null or empty during the chain validation process”. I assume this means SFOS is not using the chosen certificate on outbound communication.

Is it possible to use certificate authentication when using XG MTA for outbound SMTP?



Added V21
[edited by: Erick Jan at 4:36 AM (GMT -8) on 12 Nov 2024]
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