ERPNext - Communication - Mail was not sent with correct person

Every Doctype has comment part in the below of the form
In this comment section there is a New Mail button is there

When im using the new-mail button to sent mail to someone its not reciving
but the mail was in the communication form like this

Please help me to setup.

i have already set-up email account , if i using frappe.sendmail() in some other code it will work but this communication set up i don’t know please help me