We are no longer seeing the option to send the plain text version in a test message. Where did this feature go?
We are now sending both the HTML version and plain text version in each test message. The version to be displayed will depend on whether the email client is configured to display messages in plain text, or HTML. Instructions on configuring your email client to display in plain text can be found by searching in Google.
Example search: "display messages in plain text Microsoft Outlook 2010"