Explanation
Using RMM personalization strings to render the email reply body can be used to include the body of marketing email replies captured by Reply Mail Management (RMM) within auto-forwarded messages to their Customer Success team. RMM personalization strings are variables that can be inserted into auto-forwarded messages to display information from the original reply message, such as subject line, sender address, or reply body. References:
https://help.salesforce.com/s/articleView?id=sf.mc_es_reply_mail_management_personalization_strings.htm&ty