CloudM Migrate lets you decide how much content you would like to migrate to your shiny new system.
If you are changing your email address as part of the migration, you can verify that the domain names are correct here. You can also specify specific address replacements in the respective section of the advanced settings.
For more information on domain and address replacements, see Domain and Address Replacements.
Target Audience permissions can also be migrated but they must be replaced using Address Replacements in order to migrate successfully. If they are present on the source but not migrated to the destination platform, any items shared with it will be shared back to the source Target Audience.