Did an application not a while ago to send email to several agencies, i'm going to breakthrough the most important steps:
1)Add the desire input parameters into your email configuration 
2) Fetch the data you want to send on the email:
Get Agencies -> Agencies i want to send the email
GetRequestById -> Filter with the input parameter of my SendEmail Server Action to get the specific request

3) Configuration of the email itself:
In your case on the "To" put the email you want to test it out and every information you want to share, mapping the parameters.

Hope it helps you out! Any Questions let me know.