We use Salesforce Marketing Cloud and have thousands of records that don't appear to be in Salesforce. Hence, I want to delete these records so the two systems are in sync and we can save some money in database size.
I have a Data Extension of several thousand Email Addresses from Leads and Contacts.
I would like to know the best/easiest way to cross-check and verify this list against Salesforce data, so I can be sure it's safe to delete the records from SFMC.
Has anyone else battled a similar scenario? Thanks in advance.