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DKIM signing not working

Hi, 

we have an Exchange Server 2019 and we use our Sophos as a smarthost for outgoing E-Mails. For incoming mails we just forward them to our GFI Mail Essentials.

I've added DKIM Signing keys and selctors for our domain. But they are not added. 

We don't have a license for E-Mail protection. Is this neccessary for this feature?

Kind regards

fusi



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