What is the best practice concerning the use of different private domains (consequently sender profiles) configured with the Sender Authentication Package in Marketing Cloud? I mean: I should configure emails used for newsletter and DEM manually sent by users and triggered emails automatically sent through API call from other systems. Salesforce recommends for new client of Salesforce Marketing Cloud to warm the IP.
In this phase it is possible to find spam traps, blocking issues and so on; in order to solve them, you should build up sending history (and consequently trust with regard to domains) starting from a smart size and then continuing to double volume from week to week. These issues could give delays to send email from MC, so I was wondering if it could be a good solution to create two domains: one used only for newsletter and another for triggered. In this way I should probably not have problems in deliverability related to triggered sends. Could you confirm it?