Mailbox provider · Daum Mail
How to verify a daum.net email address
Can you verify @daum.net addresses?
YesYes. @daum.net answers mailbox checks one address at a time.
Check one address
Five checks a minute, no account needed. Nothing is sent to the address — we ask its mail server whether the mailbox exists, then disconnect.
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The checker opens an SMTP conversation with daum.net's mail server, offers a random address first to rule out a catch-all, then names your address at RCPT TO and disconnects without sending. A rejection comes back invalid ("Mailbox not found") and an acceptance valid ("Mailbox exists"). Temporary replies come back risky. It always checks the syntax, the domain's MX records, disposable domains and role addresses such as info@ first.
Mailbox existsMailbox not foundServer would not confirmDaum Mail addresses can be verified without sending an email. On 12 October 2026 the daum.net mail server mx3.hanmail.net rejected a made-up recipient at the SMTP RCPT TO step with 550 5.1.1 RUSR: No such user, so a mailbox check can tell a missing daum.net account from a real one.
Price: this tool is free. Checking a whole email list is from $9/mo, and the first 100 checks are free with Google, no card. See pricing
Live DNS snapshot: daum.net
Checked 6 November 2026, 11:12 UTCRead from DNS at the time shown and refreshed at most once a day. MX says where mail for daum.net goes; SPF and DMARC describe mail sent from it, not whether any one address exists.
- 10
mx2.hanmail.net - 10
mx3.hanmail.net - 10
mx4.hanmail.net - 10
mx1.hanmail.net
v=spf1 include:_spf.daum.net include:_external_smtp.daum.net ~allp=none: meets the requirement, but blocks nothing.
v=DMARC1; p=none; rua=mailto:[email protected]Look up any other domain with the MX lookup or the email provider lookup.
Daum Mail at a glance
| Operated by | Daum Corp.; joining requires a Kakao accountSource: Daum terms of service (Korean) |
|---|---|
| Same mailbox system | MX hosts are on hanmail.netObserved 12 October 2026 (dig MX) |
| MX hosts | mx1.hanmail.net to mx4.hanmail.netObserved 12 October 2026 (dig MX) |
| Answer to a made-up address | 550 5.1.1 RUSR: No such user, returned at RCPT TOObserved 12 October 2026 (SMTP probe of a made-up recipient, no message sent) |
| Address rule | Each Daum Mail account has both an @daum.net and an @hanmail.net addressSource: Daum help: mail settings (Korean) |
| Inactive accounts | After 90 days with no web, mobile or IMAP/POP3 access a mailbox goes dormant and stops receiving new mailSource: Daum help: mail dormancy policy (Korean) |
What Daum Mail's server says about a missing mailbox
The reply that matters is the one to RCPT TO, the step where the checking server names the recipient. Daum Mail answered our made-up daum.net address with 550 5.1.1 RUSR: No such user. A 5xx code at that step is a permanent "no such mailbox", which is the same answer a real message would get, so SimpleVerifier marks the address invalid with the reason "Mailbox not found". A 250 at the same step means the mailbox exists and comes back valid.
Before trusting a "valid", a careful verifier also offers a random address that cannot exist. Daum Mail rejected ours, so daum.net is not a catch-all: a 250 for your address is a real signal. Temporary 4xx replies (421, 450, 451) are about the connection, not the mailbox, and come back risky with "Server would not confirm" rather than invalid. Hard bounce vs soft bounce explains why that split matters.
Daum mailboxes sleep after 90 days
Daum puts a mailbox to sleep after 90 days with no access, and it then stops receiving mail. That is a short window: a daum.net or hanmail.net address collected last quarter may already be refusing mail, so re-check Korean lists often.
Every account has both domains, so [email protected] and [email protected] are the same person; treat them as duplicates when you merge lists.
Cleaning daum.net addresses on a list
Because Daum Mail answers honestly, daum.net is one of the domains where verification removes bounces before they happen. Drop the invalid results, keep the valid ones, and re-check the risky ones later: a temporary reply on one day often turns into a clear answer the next.
A valid result only means the mailbox exists today. Addresses on an old consumer list go stale as people stop using them, so re-verify before each large send to an aged segment; how often to verify an email list gives a schedule. Upload the CSV to the verifier and download the valid, risky and invalid rows as separate files.
Common questions
- Can you verify @daum.net addresses?
- Yes. @daum.net answers mailbox checks one address at a time. The checker opens an SMTP conversation with daum.net's mail server, offers a random address first to rule out a catch-all, then names your address at RCPT TO and disconnects without sending. A rejection comes back invalid ("Mailbox not found") and an acceptance valid ("Mailbox exists"). Temporary replies come back risky. It always checks the syntax, the domain's MX records, disposable domains and role addresses such as info@ first.
- Can I check if a daum.net address exists without emailing it?
- Yes. A verifier connects to Daum Mail's mail server, names the address at the RCPT TO step and disconnects before sending. On 12 October 2026 the server rejected a made-up daum.net address with "550 5.1.1 RUSR: No such user", so a missing mailbox shows up as invalid and the owner receives nothing.
- What mail servers does daum.net use?
- On 12 October 2026, daum.net published these MX hosts: mx1.hanmail.net to mx4.hanmail.net. You can look them up yourself with the free MX lookup tool.
- Why did a daum.net address come back risky instead of invalid?
- Risky means the server didn't give a permanent answer during the check, usually a temporary 4xx reply or a timeout. It isn't proof the address is bad. Check it again later; Daum Mail gave a clear rejection for a missing mailbox when we tested it.
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