area: email
action: updatedomainsettings
https://api.hypermail.com/api.php?apikey=YOURAPIKEYHERE&area=email&action=updatedomainsettings&forwardingemail=test@test.com&redirecturl=http://gooogle.com
<response>
<success>Domain Updated</success>
</response>
{
"success": "Domain Updated"
}