area: email
action: verifycustomdomain
https://api.hypermail.com/api.php?apikey=YOURAPIKEYHERE&area=email&action=verifycustomdomain&id=222
<response>
<customfromdomain><id>11</id><domain>test.com</domain>
<dkimconfirmed>Yes</dkimconfirmed></customfromdomain>
</response>
{
"customfromdomain": {
"id": "11",
"domain": "test.com",
"dkimconfirmed": "Yes"
}
}