The integration with a mass-mailing tool that we have created imports an email in the activity history of a campaign.
But then the email-to-case has to be enabled , even though we have nothing to do with cases.
Is there another solution? or we should go towards custom object to record the emails ?

thanks for the help
A.

I am getting the error: Challenge Not yet complete... here's what's wrong: 
There was an unexpected error in your org which is preventing this assessment check from completing: System.DmlException: Insert failed. First exception on row 0; first error: REQUIRED_FIELD_MISSING, Required fields are missing: [Discount_Percent__c]: [Discount_Percent__c]

Throughout this module I've been using Discount Percentage, not Discount Percent, but when I made an opportunity for Edge Communications - 1 year contract it required me to add a discount percent manually. I'm not sure what is wrong or what to do. Please help!