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., "xyc@newsletter.company.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?
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symbol and you need to include the sending email address in the Sender Profile/Profiles. No need to add it anywhere else. You can, but don’t have to configure your own Send Classifications. Delivery Profiles serve a different purpose. Please look at the documentation and also make sure you correctly configure RMM to be able to receive replies.