You may have noticed that as you send out Mailer campaigns, your campaign members are counting against your Salesforce data storage limit. Each user in your Enterprise Edition Salesforce organization is allowed up to 20MB of storage space, with a minimum of 1GB of space for your entire organization.
That may sound like a lot, but if you are sending out high-volume email campaigns, it can start to fill up quickly.
If you would like some advice on how to manage your data efficiently and reduce your data footprint as much as possible, take a look at this article by our CEO Ryan Ozimek, written for Salesforce.org.
You can find the article at Salesforce.org, here: 3 steps to setting up successful email marketing using Salesforce