Check Disposable Emails

Overview

Send a complete email address, or just a domain, to check it against a disposable email blocklist of over 100,000 throwaway and temp email domains, updated daily. The check tests both exact matches and parent domains, and separately flags privacy relay addresses such as Apple Hide My Email, DuckDuckGo and Firefox Relay, which forward to a real inbox. Paid plans also read the domain's MX records to name the relay service behind a custom domain and to catch new throwaway domains that receive mail through a known disposable service.

Live Test Check Disposable Emails Source →

Formula

One function covers the whole catalog: the first argument names the source, the next are its inputs, and the field after them says which single value lands in the cell. Formulas covers the grammar that applies to all of them.

=VERVE("emaildisposablechecker", "isDisposable")

Inputs

Required inputs are positional, in the order below, followed by the field. Everything else is passed as a "name", value pair after that — the same shape as SUMIFS. Premium inputs are accepted on every plan but only take effect on plans that include them.

Input	Type	Where it goes	Description
`email`Optional	string	"email", value	The email address to check (e.g., [email protected]). Send this or domain email
`domain`Optional	string	"domain", value	A domain to check instead of a full address (e.g., mailinator.com). Send this or email domain

Passing an option

=VERVE("emaildisposablechecker", "isDisposable", "email", "[email protected]")

What lands in your sheet

The field — the argument after the inputs — is what makes the formula resolve to one cell. Its value is a dot-path from the table below, so swapping it is how you pull a different value — one formula per column.

Seeing everything at once

Leave the field out and the formula returns the whole response instead: two columns, field name on the left and value on the right, spilling from the cell you typed in.

=VERVE("emaildisposablechecker")

Good for exploring, not for filling down

The second row's table would land on top of the first's, and every cell after the first reads #REF! (#SPILL! in Excel). Keep one per sheet, or name a field, and leave the cells below and to the right empty.

Response fields

Paths are relative to data. Each one is exactly what the field argument accepts, so swapping it is how you pull a different value into a cell. On a plan without a Premium field the cell reads #PREMIUM(field) rather than a value, so a locked field never looks like a real answer.

Use as the field	Type	Example cell value	Description
`isDisposable`	boolean	`false`	Whether the email address is a disposable address (matched by exact domain or a parent domain of the sender)
`email`	string	`[email protected]`	The email address that was checked; null when a domain was sent instead
`domain`	string	`myspace.com`	The domain that was checked, taken from the email address when one was sent
`isRelay`	boolean	`false`	The domain belongs to an email relay or forwarding service (Apple Hide My Email, DuckDuckGo, Firefox Relay, SimpleLogin, Proton Pass, addy.io, 33mail). Relay addresses stay live and forward to a real mailbox the sender never sees, so they are reported separately from isDisposable
`relayService`Premium	object	`null`	Which relay service handles the address. Also names the service when a custom domain routes its mail through SimpleLogin, addy.io, Apple or DuckDuckGo, which isRelay does not catch; null when no relay service is involved or the MX lookup failed
`isDisposableMx`Premium	boolean	`false`	The domain's mail servers belong to a known disposable email service. Catches newly registered throwaway domains that are not on the list yet, because they still receive mail through the same service; null if the MX lookup failed

When a cell doesn't fill

A failed lookup returns readable text starting with #ERR rather than a spreadsheet error, because Excel cannot show a custom message on a real error — you would get a bare #VALUE! with no reason. The trade-off is that IFERROR() will not catch it; test with LEFT(cell, 4) = "#ERR" instead. Error handling covers the rest.

Cell reads	What happened
`#ERR Not connected`	No API key saved. Open the side panel and connect your account.
`#ERR Replace <name> with a cell or value`	A preview formula was copied as-is. Swap the placeholder for a cell reference.
`#ERR No "x" in emaildisposablechecker`	An option name this source does not take. The message lists the ones it does.
`#ERR No data point "…"`	The field path is not in the response. Check it against the table above.
`#PREMIUM(field)`	The field exists but your plan does not include it.
`#ERR Out of credits`	The cycle's credits are spent. Usage resets on your billing date.

Before the formula works

The add-in reads the API key you saved once in the side panel — the key never goes in the formula, so a shared sheet does not leak it and a collaborator without access simply sees the last calculated values.

Install the add-in for Google Sheets or Excel.
Open the side panel and sign in, or paste a key from your dashboard.
Type the formula above into any cell.

Use cases

User Registration Screening: To stop fake signups, SaaS apps check user email addresses at registration and reject submissions matching temporary domain lists.
Mailing List Cleaning: Filter out temporary inboxes from marketing contact databases before scheduling newsletter campaigns to protect sender reputation and delivery rates.
Gated Content Verification: When visitors request whitepapers or trial access, verify their email domain immediately to require a genuine corporate or personal inbox.
Promo Abuse Prevention: E-commerce stores evaluate customer emails during checkout to prevent shoppers from repeatedly claiming first-order discounts with burner accounts.

Other ways to use Check Disposable Emails

Set up Check Disposable Emails on VerveSheets, or reach the same source a different way. Your VerveSheets account and credits work on all of them — one key, one balance.

Call it as a REST APIOne HTTPS endpoint and an x-api-key header, with SDKs for Node, Python and .NET.APIVerve →Reference →

Give it to an AI agentConnect over MCP and your agent calls it as a native tool — Claude, Cursor, ChatGPT.VerveKit →Reference →

Ground an agent on itA cited, machine-checkable fact your model can't produce on its own.VerveContext →Reference →