Inbox-Placement-API.

curl https://api.unspam.email/ext/v2/inbox-placement/mailboxes \
  -H "Authorization: Bearer $UNSPAM_TOKEN"

# response (200)
[
  { "id": 3,  "name": "Gmail",    "address": "..." },
  { "id": 7,  "name": "Outlook",  "address": "..." },
  ...
]

# pick the IDs you want to test,
# pass them in the next request.

curl -X POST https://api.unspam.email/ext/v2/inbox-placement \
  -H "Authorization: Bearer $UNSPAM_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{ "mailboxes": [3] }'

# response (201)
{
  "id": "abc123",
  "mailboxes": [
    { "id": 3, "name": "Gmail", "address": "..." }
  ]
}

# send your email to each address,
# with the test id somewhere in the body.

curl https://api.unspam.email/ext/v2/inbox-placement/abc123 \
  -H "Authorization: Bearer $UNSPAM_TOKEN"

# response (200)
{
  "id": "abc123",
  "status": "completed",
  "results": [
    {
      "mailbox": { "name": "Gmail", ... },
      "status":     "delivered",
      "tab":        "inbox",
      "sender_ip":  "192.0.2.1",
      "blacklists": 0
    }
  ],
  "report_url": "https://unspam.email/inbox-test/abc123"
}