For the purpose of (sending out) marketing-related campaigns, new email addresses should be created in conjunction with the newly established sub-domain (part of the sender authentication package - in short, "SAP). The domain setup has already been completed and verified by Salesforce. In our case, we opted for self-hosting the DNS using an existing sub-domain w own.
Now the question arises if the actual creation of the email addresses meant to be used for campaigns (e.g., "email@example.com") need to be created on our end, or is it something that needs to be handled by Salesforce? The internal IT team is claiming it needs to be done by Salesforce as the MX- and SPF records point to Salesforce. Does anyone know?