Yes. You can verify any @21cn.com address in real time with a direct SMTP handshake that provides 99.7% accuracy. 21cn.com is operated by 21CN Corporation, runs 1 mail server, enforces 1 of 3 authentication standards, and is currently responding to SMTP.
Every check returns one of three clear outcomes so you know exactly what to do with the address.
The mailbox exists and accepts mail. Send with confidence, the address is deliverable.
The mailbox does not exist, is disposable, or will hard-bounce. Remove it to protect your sender reputation.
The server is catch-all or greylisting, so existence cannot be confirmed. Send selectively and watch engagement.
21cn.com publishes 1 MX record. The primary mail exchanger is mta.21cn.com, hosted by 21cn.com, and it is currently reachable and answering SMTP. Mail is routed through these servers in priority order, lowest number first.
| Priority | Hostname | IP | Status |
|---|---|---|---|
| 10 | mta.21cn.com | 14.18.69.193 | Reachable |
220 21cn.com ESMTP readyYes. 21cn.com is a valid email provider, operated by 21CN Corporation. Addresses are persistent and real mail reaches a genuine recipient. Individual mailboxes still go stale, so verify each one before you send.
A live SMTP handshake connects to 21cn.com's mail server and asks whether the mailbox exists using the RCPT TO command, without ever transmitting a message. The recipient never sees the check.
Each address runs through 30+ checks including SMTP existence, catch-all detection, role-account filtering, and disposable matching. The same engine has verified billions of addresses since 2012.
Every unverified address is a gamble. Here is what happens when you skip verification and mail a list that has not been cleaned.
Free inboxes get abandoned constantly. Verification drops the dead 21cn.com mailboxes before you mail them.
Mistyped 21cn.com addresses fail a real SMTP check, so they never turn into a hard bounce.
A clean list keeps your bounce rate low, and a low bounce rate is what protects inbox placement on a big send.
Mailing only live 21cn.com addresses raises every rate that matters: opens, clicks, and replies.
21cn.com is 21CN Corporation, registered through Xiamen 35.com Information Co., Ltd. and first seen Feb 7, 1999.
21cn.com is a free email service provided by 21CN Corporation, a Chinese internet company based in Guangzhou. Originally established as one of China's early internet portals, 21CN offers email, news, and entertainment services. The email platform provides standard features including spam filtering, attachment support, and mobile access.
21cn.com publishes SPF records and supports DKIM signing for outbound email authentication. DMARC policies are in place to assist receiving mail servers in validating the authenticity of messages claiming to originate from 21cn.com addresses. Security practices align with standard Chinese ISP email conventions.
21cn.com mail servers perform recipient verification at the SMTP level and reject messages to unknown addresses. The service does not operate as a catch-all domain. Inbound connections may be subject to rate limiting, especially from sending IPs that lack an established reputation with 21CN's mail infrastructure.
Senders targeting 21cn.com users should ensure proper email authentication through SPF and DKIM, keep complaint rates low, and follow standard bulk sending best practices. Content filtering at 21CN may be more aggressive toward messages containing only images or those with suspicious URL patterns.
Upload a CSV or TXT list of 21cn.com addresses to the bulk email verifier. Every address runs through a live SMTP handshake plus catch-all, role-account and disposable detection, and you download a clean list when processing completes. For real-time checks at signup, use the real-time email verification API.
CSV or TXT with one email per line. No formatting needed.
Each 21cn.com address is checked with a live server handshake.
Get a verified list with status codes, risk flags, and catch-all detection.
Pay as you go. No subscriptions, and credits never expire.
Everything about verifying email at this domain.
Yes, 21cn.com is a valid free email domain operated by 21CN Corporation. It provides permanent email accounts to users.
No, 21cn.com is not a disposable or temporary email provider. It offers permanent email accounts with standard email features.
21cn.com uses mail servers operated by 21CN Corporation. Check the MX records section above for specific server details.
Yes, with proper opt-in consent. Follow email best practices and ensure SPF, DKIM, and DMARC authentication is configured for your sending domain.
Use BulkEmailChecker to verify 21cn.com addresses via SMTP checks. Verification behavior varies by provider. Our tool handles provider-specific rate limiting automatically.
Upload a CSV or TXT list to the bulk email verifier. Every address runs through 30+ checks including SMTP existence, catch-all detection, role-account, and disposable matching. Processing time depends on list size.
99.7% accurate using a direct SMTP handshake with 21cn.com's mail servers, the same engine that has verified billions of addresses since 2012.
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