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Email Proteccion: DKIM Broken on forwarding email.

I have a self hosted mail server which has DKIM implemented.

When an account in the internal mail server has a forward configured, the DKIM for that email breaks.

For example:

Internal account: test@tuaiti.com.ar. Forwards all incoming email to test@gmail.com

 

UTM receives the mail for test@tuaiti.com.ar and forwards it to the internal mail server.

The mail server receives it, complains about the dkim imformation, and forward to test@gmail.com
Gmail receives the email and complains about security, because of the failed DKIM test.

 

I believe that i'm missing some configuration in the UTM.

Thank you.

 



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