Hi Folks,

we use some 3rd-party web-applications that send mails to exchange online via a relay-service. These mails carry a valid dkim-signature for our primary domain (d=…). Sender address is our accepted (primary) maildomain.

Exchange Online marks these mails as outside of the organisation, as they are neither authenticated via sending-IP, nor certificate. As the relay-service is a shared service, we do not want to whitelist the ip or ssl-cert as others use this system as well.

Is there a way to use the dkim-signature to tread this mails as internal?

Thank you.

Siegmar

​Hi Folks, we use some 3rd-party web-applications that send mails to exchange online via a relay-service. These mails carry a valid dkim-signature for our primary domain (d=…). Sender address is our accepted (primary) maildomain.Exchange Online marks these mails as outside of the organisation, as they are neither authenticated via sending-IP, nor certificate. As the relay-service is a shared service, we do not want to whitelist the ip or ssl-cert as others use this system as well. Is there a way to use the dkim-signature to tread this mails as internal? Thank you. Siegmar  Read More

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