@luca_lattariniit looks like full domain name delegation is available for both Hosted and Hybrid deployment options. https://experienceleague.adobe.com/docs/campaign-classic/using/installing-campaign-classic/architecture-and-hosting-models/hosting-models-lp/capability-matrix.html?lang=en#capability-matrix
Probably the easiest way to tell, is lookup the nameservers for your sending domain (https://toolbox.googleapps.com/apps/dig/#NS/) and check what is returned. If they correspond to the IP addresses of the four Adobe nameservers listed below, then you have full domain delegation to Adobe and should be able to access the Campaign Control Panel (if you are an enterprise Campaign admin):
- a.ns.campaign.adobe.com / ns-261.awsdns-32.com (205.251.193.5)
- b.ns.campaign.adobe.com / ns-1856.awsdns-40.co.uk (205.251.199.64)
- c.ns.campaign.adobe.com / ns-653.awsdns-17.net (205.251.194.141)
- d.ns.campaign.adobe.com / ns-1527.awsdns-62.org (205.251.197.247)
If your IP addresses on your nameservers are different, then its likely you need to find who manages the DNS for the sending domain you are using and have them add the TXT record in for you.
Cheers
Darren