This simply means we need to authenticate your senders email address.

This will remove the on behalf of your name’ from the senders name and instead will come directly from your email address which looks more professional. 
To get this process underway we need to send you an email from SparkPost - which you will need to inform us to do by 
contacting our Support Helpdesk. 
When you receive the email from SparkPost it will have the subject line of 'SparkPost - Verified Domains' please
forward the email directly to our Support Desk so that we can authenticate your email address. 

Please do not click on the activation link in this email as we must do this for you.  Once your email address has been authenticated you will receive confirmation of this.