You need administrator permissions before you can remove email campaign data.
Each email campaign data record in Salesforce occupies at least 2 kilobytes of memory space. You can remove this unnecessary storage for completed and outdated email campaigns by removing certain data records from these email campaigns.
- Restrict the email campaign data options for your selected campaigns
- Click the Email Campaigns tab
- Delete your selected email campaigns from the list (this will remove all their associated data from leads and contacts)
- After the next synchronisation, the selected email campaigns will be imported only with the email campaign data that you selected in step 1. This data will also be added to the associated contact and lead records.
You'll need to remove the email campaign data from the Salesforce recycle bin before the Salesforce storage will be reduced.
Delete Operation Limit
Salesforce has a hard cap on the amount of objects that can be deleted at a given time. Deletion of campaigns that contain over 100,000 combined objects might be prevented. In this scenario you'll want to use the 'Clear Email Campaign Data' feature. This is located under the 'Advanced' option when viewing an Email Campaign.