How to Find Expired and Re-Registered Domains on an Email List
To find expired domains on an email list, compare each domain's registration date with the month you collected the address. The expired email domain checker does this: paste the list and the month it was collected, and it reads each company domain's registry record (RDAP). A registration date after that month means the domain was registered again, so the old mailboxes are gone and someone else receives the mail. Those addresses come off.
Step 1: paste the list
Paste the list or upload the CSV. Free mailbox domains such as gmail.com are skipped; only company domains are looked up.
Step 2: enter when the list was collected
Enter the month the addresses were collected, or the oldest month if the list was built over time. This is the date each domain's registration is compared against.
Step 3: read the groups
Up to 100 domains a run are read, 500 when signed in. The result groups domains and lets you download the addresses to suppress:
| Group | What it means | What to do |
|---|---|---|
| Re-registered | Registered after your list date | Remove the addresses |
| Lapsing | Registration is about to end | Remove or watch |
| Unregistered | No one holds the name | Remove; mail bounces |
| Registered before your list date | Same registration, still there | Verify the addresses |
| Couldn't be dated | The registry gives no date | Verify the addresses |
By hand you would run an RDAP or WHOIS lookup for each domain and read the registration date. The tool does that for up to 500 at a time.
Why this matters
Abandoned domains are where dead addresses collect. A company that closed lets its domain lapse, and someone else may register it. See aged and expired domains in cold email and mailing an old email list. A bounce for a domain that does not exist looks like 554 5.4.4.
What this check cannot do
- A domain registered before your list date can still have closed its mailboxes; only a verification shows that.
- Registries without RDAP, including some country endings, cannot be dated.
- It reads the registration date, not who owns the domain now.
- It checks domains, not individual addresses.
Verify the addresses that remain
Upload the rest 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" or "Mailbox not found". See bulk email verification and pricing.
Check your domains now
Paste the list into the expired email domain checker.
Common questions
Can I still email an address on an expired domain?
No. While the domain is lapsed, mail bounces. Once someone else registers it, mail reaches whoever owns the name now, not the person you collected the address from.
Is a re-registered domain a spam trap?
Not necessarily, and nobody outside the trap operators can say. It is an address that no longer belongs to your contact, which is reason enough to remove it.
Why are some domains shown as couldn't be dated?
Their registry publishes no RDAP service, or its record leaves out the registration date. They are shown as unknown rather than guessed.
Why are Gmail and Yahoo addresses skipped?
Free mailbox domains do not lapse or change hands. Their addresses go straight to the list to verify.
How many domains can I check?
100 unique company domains a run without an account, 500 after a Google sign-in. Each is one registry lookup.
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.