Other question very important. I can't figure out how to use only certain delivery servers for a campaign. For example, I have 20 servers and want to use only 10 of them, those that originate from an international domain. I created two different customer accounts, blocking each server to a specific customer account. Despite this, I receive an email that isn't included in that server group. I can't mix up and rotate all the events servers Because some have a localized domain and serve for a different language