# Check if an e-mail address has a Yahoo account

> Check in bulk whether Yahoo Mail addresses such as yahoo.com, ymail.com and rocketmail.com have an account. Yes, no or unknown; unknowns are free.

Canonical: https://mobilevalidate.com/services/yahoo-email-check · Last updated: 2026-09-25

![An e-mail envelope routed to mail servers found in DNS; two mailboxes are confirmed and one answer is unknown.](https://mobilevalidate.com/images/email-mailbox-verification.svg)

*E-mail checks look up the domain's mail servers, then whether the mailbox exists.*


The Yahoo check answers whether an e-mail address has a Yahoo Mail account. It covers `yahoo.com`, Yahoo's country domains and the older `ymail.com` and `rocketmail.com` addresses. It runs in bulk jobs and returns `registered: true`, `false` or `null` (unknown) for each address, with the time we checked. Nothing is sent to the address and no mailbox is read.

## What does the Yahoo check tell you?

It tells you whether Yahoo has an account at the exact address you send. Yahoo Mail is one of the oldest free web mail services, and over the years it has handed out addresses under several domains. Customer databases therefore contain `@yahoo.com`, country versions like `@yahoo.co.uk`, `@yahoo.fr` or `@yahoo.de`, and the alternative `@ymail.com` and `@rocketmail.com` domains.

- `registered: true`: a Yahoo account exists at this address.
- `registered: false`: a conclusive "no account".
- `registered: null`: no conclusive answer. `status` and `reason` say why, and you are not charged.

Many Yahoo addresses were created years ago and never used again. Yahoo's own terms allow it to close accounts that stay inactive, so an address that worked in an old export may no longer exist. The check answers that question for today, and `checked_at` records when.

## Who uses it, and why?

Yahoo addresses are common among long-standing consumers, which makes them important in older data and in some regional markets.

- **Hygiene for older customer records.** Before a service or account notice to existing customers, a batch run finds Yahoo addresses that no longer have an account. Updating them through another channel beats watching the message bounce.
- **Deliverability.** Large mailbox providers track how often a sender hits non-existent addresses. Removing dead Yahoo addresses protects delivery of receipts, alerts and password resets.
- **Sign-up review.** A nightly job over new sign-ups flags Yahoo addresses that never existed. That is a typical trait of scripted registrations. See [OTP and sign-up fraud](/use-cases/otp-and-signup-fraud).

For a real-time answer while the user is on the form, use the [mailbox check](/services/email-verification). To cover a whole list across providers, combine Yahoo with the [Gmail](/services/gmail-email-check) and [Outlook](/services/outlook-email-check) checks in one job.

## What do you get back?

Each address becomes a row with `kind: "email"` and one entry per check in `checks`.

| Field | Type | Meaning |
|---|---|---|
| `email` | string or null | Normalized address (trimmed, lowercased); `null` when invalid |
| `email_status` | enum | `valid`, `invalid_email`, `duplicate` or `suppressed` |
| `checks["yahoo.email"].registered` | boolean or null | `true` account exists, `false` none, `null` unknown |
| `…status` | enum | `completed`, `pending`, `unknown`, `unsupported_country` or `failed` |
| `…reason` | string or null | e.g. `UPSTREAM_TIMEOUT` |
| `…confidence`, `…checked_at` | enum, timestamp | How sure the answer is, and when it was obtained |
| `…cached`, `…billed` | boolean | Cache hit, and whether it was charged |

CSV and NDJSON downloads keep your original row order and add `yahoo.email.status`, `yahoo.email.registered` and `yahoo.email.billed` columns.

## How is it billed?

You pay the bulk price per address with a conclusive answer. You're not charged for inconclusive results (unknown, unsupported country, timeout, invalid, duplicate). Run the free `POST /v1/jobs/estimate` first to see valid, duplicate and cached counts and the maximum cost, then pass that figure as `max_cost`. See [pricing](/pricing).

Repeat checks of the same address inside the freshness window can come from your account's cache. Cache hits are free.

## What are the limits?

The Yahoo check is **bulk only**. `POST /v1/lookup` refuses it with `403 service_disabled` ("The check 'yahoo.email' is available in bulk jobs only (POST /v1/jobs)."). A job takes up to 50,000 numbers and e-mails, as JSON or as a CSV upload with an `email` column.

- Up to 20 checks per request. Identifiers × applicable checks are capped at 100,000 per job.
- Requests that look like sequential number ranges or generated e-mail lists are rejected. Twenty or more addresses in one request on one domain whose local parts differ only by digits or separators are refused with `suspected_enumeration`. Live keys are also limited to 50 addresses of one such pattern per account per UTC day.
- Addresses are trimmed and lowercased, never rewritten.
- The daily cap counts e-mail addresses like numbers (see `GET /v1/limits`).

## How do I use it responsibly?

Check addresses from your own customers, users and leads, where you have a lawful reason to process them. We never open mailboxes and never send e-mail to the address. The answer is yes, no or unknown, and never includes personal details.

An existing account does not mean consent. Don't use the check to prepare unsolicited mailings, and don't test address variations to see whether someone has a Yahoo account. The [acceptable use policy](/legal/acceptable-use) forbids both. People can object through the [opt-out form](/opt-out). Suppressed addresses are skipped and never charged.

## Example request

Test keys return fixed answers for `test.mobilevalidate.com` addresses (see [test mode](/docs/test-mode)).

```bash
curl https://api.mobilevalidate.com/v1/jobs \
  -H "Authorization: Bearer $MOBILEVALIDATE_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: yahoo-demo-001" \
  -d '{"emails": ["registered@test.mobilevalidate.com", "not-registered@test.mobilevalidate.com", "unknown@test.mobilevalidate.com"], "checks": ["yahoo"]}'
# then: GET /v1/jobs/{id}?wait=30 and GET /v1/jobs/{id}/results
```

Response of `GET /v1/jobs/{id}/results` (excerpt, test mode: the first item of `data`):

```json
{
  "kind": "email",
  "input": "re•••@test.mobilevalidate.com",
  "email": "registered@test.mobilevalidate.com",
  "email_status": "valid",
  "e164": null,
  "country": null,
  "checks": {
    "yahoo.email": {
      "service": "yahoo.email",
      "status": "completed",
      "registered": true,
      "attributes": null,
      "confidence": "high",
      "confidence_score": 0.99,
      "checked_at": "2026-09-25T14:25:31.802Z",
      "cached": false,
      "age_seconds": 0,
      "billed": false,
      "reason": null,
      "poll_after_ms": null
    }
  },
  "test": true
}
```

## Frequently asked questions

### Which domains belong to Yahoo Mail?

yahoo.com and Yahoo's country domains (for example yahoo.co.uk or yahoo.fr), plus the older ymail.com and rocketmail.com addresses that Yahoo Mail still serves. Send them all to the Yahoo check.

### Does the check send an e-mail or open the mailbox?

No. Nothing is sent to the address and no mailbox is opened or read. The answer is yes, no or unknown, never a name, avatar or profile.

### Why is the Yahoo check only in bulk jobs?

The Yahoo check is offered in bulk jobs only for now. POST /v1/lookup refuses it with service_disabled; use POST /v1/jobs. For real-time checks at sign-up, use the mailbox check (email).

### What does an unknown answer cost?

Nothing. Unknown answers have registered set to null and are not charged, like every other inconclusive result.

## Service code and modes

- Code: `yahoo.email` (input: e-mail address)
- Modes: bulk only · worldwide

## Price (live)

- Realtime: not available (bulk only)
- Bulk (POST /v1/jobs): $0.0003 per check ($0.30 per 1,000)
- You're not charged for inconclusive results (unknown, unsupported country, timeout, invalid, duplicate).

## Response fields (from the public catalog)

| Field | Type | Meaning |
|---|---|---|
| registered | boolean or null | true = found, false = not found, null = unknown (not charged) |
| status | enum | completed, pending, unknown, unsupported_country, failed |
| checked_at | timestamp | When the answer was obtained |

_Platform and brand names are used only to describe which service a check refers to. MobileValidate is not affiliated with, endorsed by or sponsored by any of these companies; all trademarks belong to their owners._