Add to mail loop

You want to add a new email to an existing mail loop. Can you please provide more context or details about the mail loop you're referring to? For example:

1. Is it a specific email thread or conversation?
2. Is it a recurring email exchange between multiple parties?
3. Are you trying to add a new email to a specific email list or distribution list?

Additionally, what platform or email client are you using to manage the mail loop? This information will help me better understand your request and provide a more accurate response.