Domain Intelligence
Last Updated:
Sina.com
Safe to Send
Sina.com is operated by Sina Corp. The domain runs 3 mail exchanges and SMTP is responsive, with 2 of 3 authentication standards in place.
Safe to Send
RISK
1
/100
Low
Verify Mailbox
Verify @sina.com emails
Live SMTP handshake against sina.com 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
Compliance approved this in two weeks thanks to SOC 2 Type II and the GDPR documentation. Verification accuracy holds at the advertised 99%+ across our 80k physician contact list. Dana Mehta · IT Director, Healthcare
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
3
Mail exchangers
Mail Exchange (MX) Records for sina.com 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
freemx3.sinamail.sina.com.cn 36.51.224.198
Reachable
#10
freemx1.sinamail.sina.com.cn 36.51.224.198
Reachable
#10
freemx2.sinamail.sina.com.cn 36.51.224.198
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 mx-97-60.mxsmail.fmail.bdx.sinanode.com ESMTP
Primary mail server accepted SMTP connection and returned a banner during the live audit.
sina.com 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 include:spf.sinamail.sina.com.cn -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 sina.com.
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;
Monitoring only. Receivers take no action when SPF or DKIM fails.
sina.com Domain Registration WHOIS · Nameservers · Registrar
RegistrarXin Net Technology Corporation
IANA ID120
RegisteredSeptember 15, 1998
Last UpdatedDecember 28, 2025
ExpiresSeptember 15, 2028
Age27 years
TLD.com
Authoritative Nameservers (6)
- ns1.sina.com.cn
- ns2.sina.com.cn
- ns3.sina.com.cn
- ns1.sina.com
- ns2.sina.com
- ns4.sina.com
Registrant
Hidden by registrar privacy service
About this Domain
About sina.com
sina.com is a major Chinese email service operated by Sina Corporation, one of China's leading online media companies headquartered in Beijing. Sina provides free email alongside news, blogging (Weibo), and entertainment services to Chinese-speaking users worldwide.
sina.com implements SPF and DKIM authentication. Sina maintains anti-spam infrastructure and operates under Chinese data protection regulations.
The sina.com mail servers enforce recipient verification and reject invalid addresses. The domain does not operate as catch-all. Rate limiting applies, particularly from international senders.
When sending to sina.com, authenticate with SPF and DKIM. International senders may face additional filtering when delivering to Chinese email platforms.
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Common Questions About sina.com
Is sina.com a disposable or temporary email provider?
No. sina.com is not a disposable email provider. It is classified as Free Email Provider operated by Sina Corp and addresses on sina.com are persistent rather than throwaway. Mail sent to a valid sina.com mailbox reaches a real recipient.
How do I verify if a sina.com email address is valid?
The fastest way to verify a sina.com email address is to use our free email checker. Enter any @sina.com mailbox at the top of this page and our system performs a real-time SMTP handshake against sina.com'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 sina.com email exists without sending a message?
Yes. Our real-time email verification API connects directly to sina.com'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 sina.com mailbox is valid, full, or non-existent. The recipient never receives anything and never sees the check.
What are the MX records for sina.com?
sina.com currently publishes 3 mail exchange (MX) records. The primary MX is freemx3.sinamail.sina.com.cn, which is the first server contacted when other mail systems try to deliver email to a sina.com 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 sina.com.
Does sina.com use SPF, DKIM, and DMARC email authentication?
sina.com 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 sina.com mail.
Why do emails to sina.com bounce or get blocked?
Bounces from sina.com 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 sina.com'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 sina.com's receivers trust you.
How can I verify a large list of sina.com email addresses?
Our bulk email verifier accepts CSV or TXT uploads with thousands or millions of sina.com addresses (or any mix of domains). Every address goes through 30+ checks including SMTP existence, sina.com 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 sina.com email addresses?
Yes, with normal hygiene. sina.com is a legitimate email service and signups from @sina.com 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 sina.com by default.
What email format does sina.com use for usernames?
Most sina.com mailboxes follow common patterns like first.last@sina.com, firstinitiallast@sina.com, or first@sina.com, but the actual local-part rules depend on Sina Corp. The only reliable way to confirm whether a specific @sina.com 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 sina.com risk score calculated?
The 0-to-100 risk score for sina.com 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 sina.com score is recomputed on every audit so it always reflects the live state of the domain.
Is sina.com a valid email domain?
Yes, sina.com is a valid free email domain operated by Sina Corp. It provides permanent email accounts to users.
Is sina.com a disposable or temporary email provider?
No, sina.com is not a disposable or temporary email provider. It offers permanent email accounts with standard email features.
What mail server does sina.com use?
sina.com uses mail servers operated by Sina Corp. Check the MX records section above for specific server details.
Can I send marketing emails to sina.com 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 sina.com?
Use BulkEmailChecker to verify sina.com addresses via SMTP checks. Verification behavior varies by provider. Our tool handles provider-specific rate limiting automatically.