area: email
action: addemail
https://api.hypermail.com/api.php?apikey=YOURAPIKEYHERE&area=email&action=addemail&id=12345&email=test@test.com
<response>
<success>Email Added to List</success>
<id>22</id>
</response>
{
"success": "Email Added to List",
"id": "22"
}