Hello, @Syam Kumar N,
Welcome to the Microsoft Q&A platform!
For reply emails, you can create a similar rule in Microsoft Exchange, but there are some limitations to be aware of. Currently, Exchange's built-in disclaimer rules append the HTML code at the bottom of the entire email thread, including replies. Unfortunately, there isn't a direct way to insert the HTML code immediately below the reply text using the built-in tools. Because it is the default setting for this. I apologize for the inconvenience.
If you need detailed steps on how to set up the rule in Exchange, here's a brief guide:
1.Open the Exchange Admin Center (EAC).
2.Navigate to Mail flow > Rules.
3.Create a new rule.
4.Name the rule.
5.Set conditions to apply the rule to reply emails.
6.Use the "Append disclaimer" action to add your HTML code.
7.Test the rule to ensure it works as expected.
Meanwhile, I sincerely suggest you post this precious suggestion to Microsoft. Microsoft will update their product based on customers' suggestions. Believe your suggestion will help many other people in the future. Your understanding and co-operation are highly appreciated.
Here is our official URL to submit your suggestion: Exchange Online · Community.
Should you need more help on this, you can feel free to post back.
If the answer is helpful, please click on “Accept answer” as it could help other members of the Microsoft Q&A community who have similar questions and are looking for solutions.
Thank you for your support and understanding.
Best Wishes,
Alex Zhang