How to Check Signup Emails for Fake Accounts (Disposable, New, Dead Domains)
To check signups for fake accounts, flag the signals around each address: disposable domains, domains that cannot receive mail, parked or brand-new domains, typos and role addresses. Paste your signup export into the signup email risk checker and each row gets a risk level (High risk, Review, Low risk or No flags) with every flag and its reason, so you decide what to block. Syntax, typo and role checks run in your browser; only the unique domains are looked up on our server.
Flags are signals, not proof. A new company domain can belong to a real business.
Step 1: paste or upload
Paste signup emails one per line, or upload your export as a CSV. The email column is found for you. The limit counts unique domains: 100 a run without an account, 500 when signed in, so an export with thousands of Gmail addresses still fits.
Step 2: run the check
Domains are looked up ten at a time. By hand you would check each domain against a disposable list, look up its MX record and read its registration date from RDAP. See finding disposable emails in a list.
Step 3: read the flags
| Flag | Why it matters |
|---|---|
| Disposable domain or mail server | Throwaway inbox; "Disposable address" |
| Domain cannot receive mail | No MX record; the address will bounce |
| Parked domain | Not a working mail domain |
| Registered in the last 30 days | High risk; under 180 days is a review flag |
| Likely typo | gmial.com and similar; the person never gets your mail |
| Role address | info@, admin@: a shared inbox; see role-based email addresses |
Filter by risk and download the CSV to block, review or verify. Preventing the bad ones at the form is covered in blocking disposable emails at signup.
What this check cannot do
- Flags are signals, not proof.
- Domain age needs RDAP, which some country-code registries do not publish.
- It does not check whether the mailbox exists, or look at IPs and devices.
- Up to 100 unique domains a run without an account, 500 signed in.
Check that the mailboxes exist
A clean domain does not mean a real mailbox. Upload the signups on the verify page: the first 100 email checks are free with a Google sign-in, no card. Each address comes back valid, risky or invalid with a reason such as "Mailbox exists", "Mailbox not found" or "Disposable address". See bulk email verification and pricing.
Check your signups now
Paste the export into the signup email risk checker.
You can test a single suspicious signup in the free fake email checker.
Common questions
How do I check if signups are fake?
Export the signup emails and run them through the signup risk checker. Each is checked for disposable, parked, brand-new or dead domains, typos and role addresses, and every flag comes with its reason.
What counts as a new domain?
One the registry says was registered in the last 30 days is flagged high risk, and one under 180 days is flagged for review. The date comes from the registry's RDAP record.
Is a Gmail signup risky?
Not by itself. Personal webmail is labelled so you can separate consumers from companies, but it is only flagged when something else is wrong, such as a typo or broken syntax.
Are my users' addresses sent anywhere?
No. Syntax, typo and role checks run in your browser. Only the domains are sent to our server for the disposable, MX, registry and nameserver lookups, and nothing is stored.
Does it check that the mailbox exists?
No. It looks at the domain and the address shape. A mailbox check is a separate step.
Check your list before you send
Real mailbox checks over SMTP, and nothing is sent to the address. Sign in with Google and your first 100 email checks are free, no card. Plans for bigger lists are on the pricing page.