Thank you for reaching out to the API Support team here at Constant Contact.
It appears you are running into a known issue with creating emails with unsupported characters within them. In looking at the HTML that came over for this email, I found an instancea of a "smart" or "curly" apostrophe. Though it appears similar ( ’ vs ' ), only the standard apostrophe (the second one) is available to be used.
While this should return an error, the known issue is that we are creating the email with these special characters anyway. This issue has been brought to the attention of our engineering and development teams for investigation. The workaround at this point is remove any of these unsupported characters from the code before submitting.
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