Solved Mailchimp Issue 

While trying to send out an email this morning I got stuck with this error message. 

“Your list has an email type option, so the text part is required”

Mailchimp has settings for each list and the issue is buried in there. 

  1. Go to “Lists” 
  2. Select the list in question 
  3. Then “settings”
  4. Then “List Name and Defaults”
  5. Uncheck “let users pick plain text or html”

That fixed the problem for me and let me send the email.