We are facing an issue for outbound emails where we are appending the original email body content parsed from the email listener and when we check the outbound email in outlook the original email content gets all jumbled. 

The original email body content is mapped to .pyEmailBody property which is referenced in the  correspondence rule that is used to sending outbound emails using Pega OOTB rule "SendEmailNotification". On the OOTB rule we have passed all required parameters for sending email and also set HTMLmessage as true.

Note : When we print the original email content and the Message parameter input to  SendEmailNotification activity rule in the log, we could see all the HTML tags and the content looks all formatted as expected.