Domain Intelligence
Last Updated:
Netzero.net
Safe to Send
Netzero.net is operated by United Online. The domain runs 2 mail exchanges and SMTP is responsive, with 2 of 3 authentication standards in place.
Safe to Send
RISK
27
/100
Low
Verify Mailbox
Verify @netzero.net emails
Live SMTP handshake against netzero.net mail servers. No email is sent. 10 free per day, no signup.
Trusted by 400,000+ senders
4.9/5
From 8,500+ verified reviews
I run cold for an agency. We've used Hunter, NeverBounce, and ZeroBounce. This matches them on accuracy and is meaningfully cheaper at our volume. Switched everything over in March. Priya Nair
SOC 2 Type II
GDPR
CCPA
99.7% Accuracy
Disposable
No
Persistent addresses, not throwaway
SMTP Live
Yes
Mail server responds to SMTP handshake
MX Records
2
Mail exchangers
Mail Exchange (MX) Records for netzero.net Mail Exchange records. They tell other mail servers which hosts are responsible for receiving email at this domain, in priority order. Lower priority numbers are tried first.
#10
mx.dca.untd.com 64.136.44.37
Reachable
#10
mx.vgs.untd.com 64.136.52.37
Reachable
SMTP Handshake
Simple Mail Transfer Protocol. We open a live SMTP connection to the primary MX and read the greeting banner. A response confirms the mail server is alive and accepting connections.
Responsive
BANNER220 mx04.dca.untd.com ESMTP
Primary mail server accepted SMTP connection and returned a banner during the live audit.
netzero.net Email Authentication SPF · DKIM · DMARC
SPF
Sender Policy Framework. A DNS record listing which servers are allowed to send mail for this domain. Receivers reject or flag mail from unauthorized servers.
Pass
TXTv=spf1 ip4:64.136.0.0/20 ip4:64.136.16.0/21 ip4:64.136.22.0/24 ip4:64.136.28.0/22 ip4:64.136.30.0/24 ip4:64.136.32.0/20 ip4:64.136.50.0/23 ip4:64.136.52.0/22 ?all
Authorized senders are defined and pass SPF policy.
DKIM
DomainKeys Identified Mail. The sending server cryptographically signs outbound mail with a private key, and receivers verify the signature using a public key in DNS.
Missing
No DKIM signature detected on common selectors for netzero.net.
No DKIM signature was detected. Receivers cannot verify the integrity of outbound mail.
DMARC
Domain-based Message Authentication, Reporting & Conformance. Tells receivers what to do when SPF or DKIM checks fail: none, quarantine, or reject.
None
TXTv=DMARC1; p=none; pct=10; rua=mailto:dmarc-aggregate-reports@logs.untd.com
Monitoring only. Receivers take no action when SPF or DKIM fails.
netzero.net Domain Registration WHOIS · Nameservers · Registrar
RegistrarCSC Corporate Domains, Inc.
IANA ID299
RegisteredMay 24, 1997
Last UpdatedApril 25, 2026
ExpiresMay 24, 2026
Age28 years
TLD.net
Authoritative Nameservers (3)
- AUTHNS3.UNTD.COM
- AUTHNS2.UNTD.COM
- AUTHNS1.UNTD.COM
Registrant
NetZero, Inc.
CA, UNITED STATES
About this Domain
About netzero.net
netzero.net is a free email and internet service operated by United Online in the United States. Launched in 1998, NetZero became known for offering free internet access and email to American consumers. The service continues operating with both free and paid tiers.
netzero.net supports SPF authentication for outbound email. As a legacy provider, NetZero maintains standard anti-spam filtering.
The netzero.net mail servers validate recipients and reject invalid mailboxes. The domain does not operate as catch-all. Rate limiting may apply for unfamiliar senders.
For delivery to netzero.net, authenticate with SPF. Follow CAN-SPAM requirements and maintain clean lists for reliable delivery.
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Common Questions About netzero.net
Is netzero.net a disposable or temporary email provider?
No. netzero.net is not a disposable email provider. It is classified as Free Email Provider operated by United Online and addresses on netzero.net are persistent rather than throwaway. Mail sent to a valid netzero.net mailbox reaches a real recipient.
How do I verify if a netzero.net email address is valid?
The fastest way to verify a netzero.net email address is to use our free email checker. Enter any @netzero.net mailbox at the top of this page and our system performs a real-time SMTP handshake against netzero.net's mail servers, confirming whether the mailbox exists, is reachable, and is safe to send to. No email is ever delivered during the check.
Can I check if a netzero.net email exists without sending a message?
Yes. Our real-time email verification API connects directly to netzero.net's mail server, opens an SMTP session, and queries the mailbox using the RCPT TO command without ever transmitting an actual email. The server's response confirms whether the netzero.net mailbox is valid, full, or non-existent. The recipient never receives anything and never sees the check.
What are the MX records for netzero.net?
netzero.net currently publishes 2 mail exchange (MX) records. The primary MX is mx.dca.untd.com, which is the first server contacted when other mail systems try to deliver email to a netzero.net address. The full list with priorities and IP addresses is in the MX Records panel above. MX records tell sending servers where to route email for netzero.net.
Does netzero.net use SPF, DKIM, and DMARC email authentication?
netzero.net has 2 of the 3 standard email authentication records in place: SPF, and DMARC (policy: none). Adding the missing layer(s) would tighten anti-spoofing protection and improve deliverability for legitimate netzero.net mail.
Why do emails to netzero.net bounce or get blocked?
Bounces from netzero.net usually fall into three buckets: the mailbox doesn't exist (5xx user unknown), the inbox is full, or your sending domain isn't authenticated to netzero.net's satisfaction. The fastest fix is to run each address through a free email verifier before you send, and to make sure your own SPF, DKIM, and DMARC are configured correctly so netzero.net's receivers trust you.
How can I verify a large list of netzero.net email addresses?
Our bulk email verifier accepts CSV or TXT uploads with thousands or millions of netzero.net addresses (or any mix of domains). Every address goes through 30+ checks including SMTP existence, netzero.net catch-all detection, role-account detection, and disposable-domain matching. Results typically come back within minutes and previously-failed addresses on your blacklist are reprocessed for free. For continuous high-volume needs, see our unlimited email verification API.
Is it safe to accept signups from netzero.net email addresses?
Yes, with normal hygiene. netzero.net is a legitimate email service and signups from @netzero.net behave like any other real user. Pipe each address through a real-time email verifier API at the moment of signup to catch typos and dead mailboxes, but there is no need to block netzero.net by default.
What email format does netzero.net use for usernames?
Most netzero.net mailboxes follow common patterns like first.last@netzero.net, firstinitiallast@netzero.net, or first@netzero.net, but the actual local-part rules depend on United Online. The only reliable way to confirm whether a specific @netzero.net address exists is to run it through a free email verification tool. Guessing patterns will produce a high bounce rate and damage your sender reputation.
How is the netzero.net risk score calculated?
The 0-to-100 risk score for netzero.net combines disposable-domain classification, mail-server reachability, MX record presence and depth, SPF / DKIM / DMARC enforcement, DMARC policy strength, SMTP banner response, and domain age. Lower scores mean safer to send to. Disposable domains are pinned at the high end of the scale. The netzero.net score is recomputed on every audit so it always reflects the live state of the domain.
Is netzero.net a valid email domain?
Yes, netzero.net is a valid free email domain operated by United Online. It provides permanent email accounts to users.
Is netzero.net a disposable or temporary email provider?
No, netzero.net is not a disposable or temporary email provider. It offers permanent email accounts with standard email features.
What mail server does netzero.net use?
netzero.net uses mail servers operated by United Online. Check the MX records section above for specific server details.
Can I send marketing emails to netzero.net addresses?
Yes, with proper opt-in consent. Follow email best practices and ensure SPF, DKIM, and DMARC authentication is configured for your sending domain.
How do I verify an email address at netzero.net?
Use BulkEmailChecker to verify netzero.net addresses via SMTP checks. Verification behavior varies by provider. Our tool handles provider-specific rate limiting automatically.