For managed domains in an inline setting or without ExchangeOnline, the DKIM key has to be used for the ARC seal.

 

Mail flow:

 

 

 

SEPPmail Secure E-Mail Gateway has to sign with DKIM per Managed Domain.

 

Settings per Managed Domain:

•Add DKIM signature to outgoing mails from this domain

•Add ARC seal to incoming mails for this domain

•Key Source: Use the DKIM Key