Hi Natasha,
This post goes over the error message you are receiving in more detail: http://help.contactology.com/mqs-deduction-spam-body-message-only-has-text/html-mime-parts
"It means that you need to create a plain-text version of your campaign. While most contacts will be able to receive the HTML version of your message, there are still contacts out there who can only get a plain text version. Most people view their emails in HTML (which means they can see images, links in the email are clickable, and text is formatted), but email clients can be set up to display only plain-text versions of email."
If you have already added the Text Version to your email and you are still getting this error message, I would suggest that you open a support ticket so that we can take a closer look. You can open a support ticket here: http://support.clickdimensions.com/anonymous_requests/new