youku.com

RSA keys shorter than 2048 bits are considered weak. Current key is approximately 1296 bits.

The rua= URI sends reports to service.alibaba.com, but no authorization record exists at youku.com._report._dmarc.service.alibaba.com. Reports will be silently dropped by compliant receivers.

The ruf= URI sends reports to service.alibaba.com, but no authorization record exists at youku.com._report._dmarc.service.alibaba.com. Reports will be silently dropped by compliant receivers.

No sp= tag set and p=none. Subdomains inherit the monitoring-only policy, leaving them open to spoofing.

MX records should not point to a CNAME (RFC 2181). This can cause delivery failures.

Certificate subject 'mail.aliyun.com' does not match hostname 'mx2.youku.com'. SANs: mail.aliyun.com, alimail.alibaba.com, alimail-hybrid.aliyun.com, alimailws.alibaba-inc.com, alimei-api-40.alibaba.com, alimei-api-40.aliyun.com, alimei-api.alibaba.com, alimei-api.aliyun.com, alimei-api-sg.aliyuncs.com, alimei-api-us.alibaba.com, alimei-api-us.aliyun.com, alimei-auth-40.alibaba.com, alimei-auth.alibaba.com, alimei-auth.aliyun.com, alimei-auth.sg.aliyun.com, alimei-auth-sg.aliyuncs.com, alimei-auth-us.alibaba.com, alimei-auth.us.aliyun.com, alimei-content.alibaba.com, alimei-content.aliyun.com, alimei-content-sg.aliyuncs.com, alimei-content-us.alibaba.com, alimei-preview.alibaba.com, alimei-preview.aliyun.com, alimei-preview-sg.aliyuncs.com, alimei-preview-us.alibaba.com, alimei-pub-us.alibaba.com, alimei-sub-40.alibaba.com, alimei-sub.alibaba.com, alimei-sub.aliyun.com, alimei-sub-sg.aliyuncs.com, alimei-sub-us.aliyun.com, aliyunmx.mail.alibaba.com, autodiscover.alibaba-inc.com, autodiscover.mxhichina.com, ay29u.mx.alibaba-inc.com, caldav40.alibaba-inc.com, caldav.alibaba-inc.com, caldav.aliyun.com, caldav.mxhichina.com, caldav.sg.aliyun.com, caldavus.alibaba-inc.com, email.aliyun.com, email.mxhichina.com, ex40.alibaba-inc.com, ex.alibaba-inc.com, exmail.aliyun.com, exmobile40.alibaba-inc.com, exmobile.alibaba-inc.com, exmobileus.alibaba-inc.com, ex.mxhichina.com, ex-oversea.alibaba-inc.com, exus.alibaba-inc.com, groupmail.hichina.com, imap40.alibaba-inc.com, imap.alibaba.com, imap.alibaba-inc.com, imap.aliyun.com, imaphk.qiye.aliyun.com, imap-inc.alibaba-inc.com, imap-inc.aliyun.com, imap.mxhichina.com, imap.qiye.aliyun.com, imap.sg.aliyun.com, imapus.alibaba-inc.com, ldap40.alibaba-inc.com, ldap.alibaba-inc.com, ldap.mxhichina.com, ldap.sg.aliyun.com, ldapus.alibaba-inc.com, mail.alibaba-inc.com, mail.dingtalk.com, mailhelp.aliyun.com, mailhelp.mxhichina.com, mail.hichina.com, mailhw.mxhichina.com, mail-inc.qiye.aliyun.com, mail.mxhichina.com, mailopen-netdisk.aliyun.com, mailopen-ws.aliyun.com, mail.qiye.aliyun.com, mailservice.alibaba.com, mail.sg.aliyun.com, mailsso.aliyun.com, mailsso-beta.aliyun.com, mailsso.mxhichina.com, mailsso-personal.aliyun.com, mailsso.sg.aliyun.com, mailsso.us.aliyun.com, mailtry.alibaba-inc.com, mailus.alibaba-inc.com, mx01.mail.alibaba.com, mx02.mail.alibaba.com, mx03.mail.alibaba.com, mx1.alibaba-inc.com, mx1.aliyun.com, mx1.mail.aliyun.com, mx1.mail.aliyun-inc.com, mx1.mail.service.aliyun.com, mx1.qiye.aliyun.com, mx1.sg.aliyun.com, mx2.enterprise.china.alibaba.com, mx2.mail.aliyun.com, mx2.qiye.aliyun.com, mx2.sg.aliyun.com, mx3.enterprise.china.alibaba.com, mx3.qiye.aliyun.com, mx.enterprise.china.alibaba.com, mx.hk.alibaba-inc.com, mx-inc.alibaba-inc.com, mxn.mxhichina.com, mxus1.alibaba-inc.com, mxus.mail.alibaba.com, mxus.mxhichina.com, mxw.mxhichina.com, pop3.alibaba-inc.com, pop3.aliyun.com, pop3.aliyun-inc.com, pop3.mxhichina.com, pop40.alibaba-inc.com, pop.alibaba.com, pop.qiye.aliyun.com, pop.sg.aliyun.com, popus.alibaba-inc.com, pre-alimei-api-40.aliyun.com, pre-alimei-api.aliyun.com, pre-alimei-api-sg.aliyuncs.com, pre-alimei-api-us.aliyun.com, pre-alimei-auth.aliyun.com, pre-alimei-auth.sg.aliyun.com, pre-alimei-auth.us.aliyun.com, pre-alimei-content.aliyun.com, pre-alimei-content.sg.aliyun.com, pre-alimei-sub.aliyun.com, pre-alimei-sub-sg.aliyuncs.com, pre-alimei-sub-us.aliyun.com, pre-mailsso.aliyun.com, pre-mailsso-personal.aliyun.com, pre-mailsso.sg.aliyun.com, pre-mailsso.us.aliyun.com, qiye.aliyun.com, smtp40.alibaba-inc.com, smtp.alibaba.com, smtp.alibaba-inc.com, smtp.aliyun.com, smtp.dm.aliyun.com, smtpdm.aliyun.com, smtpdm-ap-southeast-1.aliyun.com, smtpdm-ap-southeast-2.aliyun.com, smtphk.qiye.aliyun.com, smtp-inc.alibaba-inc.com, smtp-inc.aliyun.com, smtp-inner.alibaba-inc.com, smtp.mxhichina.com, smtp.ocm.aliyun.com, smtp.qiye.aliyun.com, smtp.sg.aliyun.com, smtpus.alibaba-inc.com, static.mxhichina.com, usimap.mail.alibaba.com, usimap.mxhichina.com, usmail.mxhichina.com, usmailsso.mxhichina.com, uspop3.mail.alibaba.com, uspop3.mxhichina.com, ussmtp.mail.alibaba.com, ussmtp.mxhichina.com, webmail.alibaba-inc.com, work.aliyun.com, smtpdm-ap-southeast-1.aliyuncs.com, popv6.qiye.aliyun.com, imapv6.qiye.aliyun.com, smtpv6.qiye.aliyun.com, mx1.lazada.sg, mx2.lazada.sg, ex.qiye.aliyun.com, smtpdm-us-east-1.aliyuncs.com, pre-mail.dingtalk.com, pre-alimei-preview-personal.aliyuncs.com, alimei-preview-personal.aliyuncs.com, alimail-cn.aliyuncs.com, alimail-personal.aliyuncs.com, alimail-beta.aliyuncs.com, alimail-sg.aliyuncs.com, alimail-us.aliyuncs.com, pre-alimail-cn.aliyuncs.com, pre-alimail-personal.aliyuncs.com, pre-alimail-beta.aliyuncs.com, pre-alimail-sg.aliyuncs.com, pre-alimail-us.aliyuncs.com, dm-cn.aliyuncs.com, dm-sg.aliyuncs.com, ex.sg.aliyun.com, ldap.qiye.aliyun.com, smtp.em.dingtalk.com, pop.em.dingtalk.com, imap.em.dingtalk.com, mx1.em.dingtalk.com, mx2.em.dingtalk.com, mx3.em.dingtalk.com, smtpdm-eu-central-1.aliyuncs.com, dm-us.aliyuncs.com, dm-de.aliyuncs.com, mailbee.dingtalk.com, mailbee.aliyun.com, pre-mailbee.dingtalk.com, alimail-de.aliyuncs.com, alimail-hk.aliyuncs.com, sendify.dingstore.cn, sendify.dingstore.com, dingstore.cn, dingstore.com, www.dingstore.cn, www.dingstore.com, smtpdm-eu-central-1.aliyun.com, mx1.sendify.dingstore.cn, mx2.sendify.dingstore.cn, mx3.sendify.dingstore.cn, acalendar.qiye.aliyun.com

Certificate subject 'mail.aliyun.com' does not match hostname 'mx1.youku.com'. SANs: mail.aliyun.com, alimail.alibaba.com, alimail-hybrid.aliyun.com, alimailws.alibaba-inc.com, alimei-api-40.alibaba.com, alimei-api-40.aliyun.com, alimei-api.alibaba.com, alimei-api.aliyun.com, alimei-api-sg.aliyuncs.com, alimei-api-us.alibaba.com, alimei-api-us.aliyun.com, alimei-auth-40.alibaba.com, alimei-auth.alibaba.com, alimei-auth.aliyun.com, alimei-auth.sg.aliyun.com, alimei-auth-sg.aliyuncs.com, alimei-auth-us.alibaba.com, alimei-auth.us.aliyun.com, alimei-content.alibaba.com, alimei-content.aliyun.com, alimei-content-sg.aliyuncs.com, alimei-content-us.alibaba.com, alimei-preview.alibaba.com, alimei-preview.aliyun.com, alimei-preview-sg.aliyuncs.com, alimei-preview-us.alibaba.com, alimei-pub-us.alibaba.com, alimei-sub-40.alibaba.com, alimei-sub.alibaba.com, alimei-sub.aliyun.com, alimei-sub-sg.aliyuncs.com, alimei-sub-us.aliyun.com, aliyunmx.mail.alibaba.com, autodiscover.alibaba-inc.com, autodiscover.mxhichina.com, ay29u.mx.alibaba-inc.com, caldav40.alibaba-inc.com, caldav.alibaba-inc.com, caldav.aliyun.com, caldav.mxhichina.com, caldav.sg.aliyun.com, caldavus.alibaba-inc.com, email.aliyun.com, email.mxhichina.com, ex40.alibaba-inc.com, ex.alibaba-inc.com, exmail.aliyun.com, exmobile40.alibaba-inc.com, exmobile.alibaba-inc.com, exmobileus.alibaba-inc.com, ex.mxhichina.com, ex-oversea.alibaba-inc.com, exus.alibaba-inc.com, groupmail.hichina.com, imap40.alibaba-inc.com, imap.alibaba.com, imap.alibaba-inc.com, imap.aliyun.com, imaphk.qiye.aliyun.com, imap-inc.alibaba-inc.com, imap-inc.aliyun.com, imap.mxhichina.com, imap.qiye.aliyun.com, imap.sg.aliyun.com, imapus.alibaba-inc.com, ldap40.alibaba-inc.com, ldap.alibaba-inc.com, ldap.mxhichina.com, ldap.sg.aliyun.com, ldapus.alibaba-inc.com, mail.alibaba-inc.com, mail.dingtalk.com, mailhelp.aliyun.com, mailhelp.mxhichina.com, mail.hichina.com, mailhw.mxhichina.com, mail-inc.qiye.aliyun.com, mail.mxhichina.com, mailopen-netdisk.aliyun.com, mailopen-ws.aliyun.com, mail.qiye.aliyun.com, mailservice.alibaba.com, mail.sg.aliyun.com, mailsso.aliyun.com, mailsso-beta.aliyun.com, mailsso.mxhichina.com, mailsso-personal.aliyun.com, mailsso.sg.aliyun.com, mailsso.us.aliyun.com, mailtry.alibaba-inc.com, mailus.alibaba-inc.com, mx01.mail.alibaba.com, mx02.mail.alibaba.com, mx03.mail.alibaba.com, mx1.alibaba-inc.com, mx1.aliyun.com, mx1.mail.aliyun.com, mx1.mail.aliyun-inc.com, mx1.mail.service.aliyun.com, mx1.qiye.aliyun.com, mx1.sg.aliyun.com, mx2.enterprise.china.alibaba.com, mx2.mail.aliyun.com, mx2.qiye.aliyun.com, mx2.sg.aliyun.com, mx3.enterprise.china.alibaba.com, mx3.qiye.aliyun.com, mx.enterprise.china.alibaba.com, mx.hk.alibaba-inc.com, mx-inc.alibaba-inc.com, mxn.mxhichina.com, mxus1.alibaba-inc.com, mxus.mail.alibaba.com, mxus.mxhichina.com, mxw.mxhichina.com, pop3.alibaba-inc.com, pop3.aliyun.com, pop3.aliyun-inc.com, pop3.mxhichina.com, pop40.alibaba-inc.com, pop.alibaba.com, pop.qiye.aliyun.com, pop.sg.aliyun.com, popus.alibaba-inc.com, pre-alimei-api-40.aliyun.com, pre-alimei-api.aliyun.com, pre-alimei-api-sg.aliyuncs.com, pre-alimei-api-us.aliyun.com, pre-alimei-auth.aliyun.com, pre-alimei-auth.sg.aliyun.com, pre-alimei-auth.us.aliyun.com, pre-alimei-content.aliyun.com, pre-alimei-content.sg.aliyun.com, pre-alimei-sub.aliyun.com, pre-alimei-sub-sg.aliyuncs.com, pre-alimei-sub-us.aliyun.com, pre-mailsso.aliyun.com, pre-mailsso-personal.aliyun.com, pre-mailsso.sg.aliyun.com, pre-mailsso.us.aliyun.com, qiye.aliyun.com, smtp40.alibaba-inc.com, smtp.alibaba.com, smtp.alibaba-inc.com, smtp.aliyun.com, smtp.dm.aliyun.com, smtpdm.aliyun.com, smtpdm-ap-southeast-1.aliyun.com, smtpdm-ap-southeast-2.aliyun.com, smtphk.qiye.aliyun.com, smtp-inc.alibaba-inc.com, smtp-inc.aliyun.com, smtp-inner.alibaba-inc.com, smtp.mxhichina.com, smtp.ocm.aliyun.com, smtp.qiye.aliyun.com, smtp.sg.aliyun.com, smtpus.alibaba-inc.com, static.mxhichina.com, usimap.mail.alibaba.com, usimap.mxhichina.com, usmail.mxhichina.com, usmailsso.mxhichina.com, uspop3.mail.alibaba.com, uspop3.mxhichina.com, ussmtp.mail.alibaba.com, ussmtp.mxhichina.com, webmail.alibaba-inc.com, work.aliyun.com, smtpdm-ap-southeast-1.aliyuncs.com, popv6.qiye.aliyun.com, imapv6.qiye.aliyun.com, smtpv6.qiye.aliyun.com, mx1.lazada.sg, mx2.lazada.sg, ex.qiye.aliyun.com, smtpdm-us-east-1.aliyuncs.com, pre-mail.dingtalk.com, pre-alimei-preview-personal.aliyuncs.com, alimei-preview-personal.aliyuncs.com, alimail-cn.aliyuncs.com, alimail-personal.aliyuncs.com, alimail-beta.aliyuncs.com, alimail-sg.aliyuncs.com, alimail-us.aliyuncs.com, pre-alimail-cn.aliyuncs.com, pre-alimail-personal.aliyuncs.com, pre-alimail-beta.aliyuncs.com, pre-alimail-sg.aliyuncs.com, pre-alimail-us.aliyuncs.com, dm-cn.aliyuncs.com, dm-sg.aliyuncs.com, ex.sg.aliyun.com, ldap.qiye.aliyun.com, smtp.em.dingtalk.com, pop.em.dingtalk.com, imap.em.dingtalk.com, mx1.em.dingtalk.com, mx2.em.dingtalk.com, mx3.em.dingtalk.com, smtpdm-eu-central-1.aliyuncs.com, dm-us.aliyuncs.com, dm-de.aliyuncs.com, mailbee.dingtalk.com, mailbee.aliyun.com, pre-mailbee.dingtalk.com, alimail-de.aliyuncs.com, alimail-hk.aliyuncs.com, sendify.dingstore.cn, sendify.dingstore.com, dingstore.cn, dingstore.com, www.dingstore.cn, www.dingstore.com, smtpdm-eu-central-1.aliyun.com, mx1.sendify.dingstore.cn, mx2.sendify.dingstore.cn, mx3.sendify.dingstore.cn, acalendar.qiye.aliyun.com

The IP 47.246.137.48 has no PTR record. Forward-confirmed reverse DNS requires a PTR that resolves back to the IP.

The IP 47.246.137.48 has no PTR record. Forward-confirmed reverse DNS requires a PTR that resolves back to the IP.

The p=none policy only monitors; it does not instruct receivers to quarantine or reject unauthenticated mail.

The rua= URI points to service.alibaba.com but no authorization record exists at youku.com._report._dmarc.service.alibaba.com.

The IP 47.246.137.48 (for mx2.youku.com) has no reverse DNS record.

The IP 47.246.137.48 (for mx1.youku.com) has no reverse DNS record.

Without MTA-STS, mail transport encryption cannot be enforced and is vulnerable to downgrade attacks.

STARTTLS alone is vulnerable to downgrade attacks. Neither MTA-STS nor DANE is configured to enforce encryption.

The SOA expire value is 3600s (<604,800s / 7 days). Secondary nameservers may stop serving the zone prematurely.

Without TLS-RPT, you will not receive reports about TLS negotiation failures.

No evidence of ARC (Authenticated Received Chain) support on MX servers. Forwarded messages may lose authentication.

The IP 47.246.137.48 is shared across 2 MX hostnames, reducing redundancy.

No iodef tag is present in the CAA records. CA policy violation reports will not be sent.

The SPF record is properly configured with valid syntax and within lookup limits.

SPF record is within safe DNS packet size limits.

No RFC 8301 compliance issues detected in DKIM key configuration.

All DKIM keys use RSA-2048+ or Ed25519, consistent with current best practices.

The DMARC record does not use any tags deprecated in DMARCbis (pct, rf, ri).

Domain has SPF, DKIM, and DMARC — meeting Google/Yahoo 2024 bulk sender requirements for email authentication.

No open relay, VRFY/EXPN, or banner disclosure issues detected.

The mail server accepts postmaster@ and abuse@ and uses a valid FQDN in EHLO.

IPv6 records are present and properly configured.

All nameservers are responsive, consistent, and properly secured.

All authoritative nameservers return consistent answers with proper AA flags.

All critical DNS record TTLs are within recommended ranges.

No DKIM key record with v=2 was found across common selectors. DKIM2 is an emerging standard and not yet widely deployed.

DKIM alignment is relaxed, SPF alignment is relaxed.

The DMARC record does not include the np (non-existent subdomain policy) tag. Consider adding np=reject to protect non-existent subdomains under DMARCbis.

The DMARC record does not include the psd (public suffix domain) indicator. Consider adding psd=n to explicitly identify this as an organizational domain.

The primary MX does not advertise REQUIRETLS (RFC 8689). This is an emerging standard — MTA-STS and DANE provide adequate TLS enforcement for most deployments.

DANE is not configured for any MX server. This is optional but provides strong certificate binding.

BIMI is not configured. Your brand logo will not display in supporting email clients.

Detected open mail-related ports: 25

DKIM signing is configured. RFC 8058 compliance depends on List-Unsubscribe and List-Unsubscribe-Post headers being included in outbound messages and DKIM signatures.

All MX IPs are in the same /16 network. Consider diversifying across networks for resilience.

Serial: 2017041914, Refresh: 3600s, Retry: 1200s, Expire: 3600s, Min TTL: 360s

CAA records restrict certificate issuance to: globalsign.com

The domain has moderate enumerability. CT logs and DNS records reveal significant information about the domain structure.

No DNSKEY or DS records were found. DNS responses are not cryptographically authenticated.

The DNS server responds to ANY queries with 17 record(s). The low record count limits amplification risk, but ANY responses still aid reconnaissance.

No dangling MX records detected — all MX hostnames resolve to valid IP addresses.

The domain has explicit MX records — no implicit A-record fallback delivery.

No non-routable IP addresses or internal references were found in public DNS records.

No Microsoft Autodiscover, Mozilla Autoconfig, or email SRV records were found.

Subdomains were enumerated via Certificate Transparency logs, DNS wordlist brute-forcing, and DNS record analysis.

Certificate Transparency logs contain 0 certificate(s) for youku.com and its subdomains. Each certificate reveals subdomain names.

The SMTP banner identifies as 'mx1.alibaba-inc.com' but the MX hostname is 'mx2.youku.com'. Microsoft and other receivers flag this mismatch as suspicious infrastructure.

The HSTS header has max-age=0, which instructs browsers to forget the HSTS policy. This provides no transport security enforcement.

Domain and MX IPs checked against 55 DNSBLs — no listings found.

Found security.txt at https://youku.com/.well-known/security.txt.

Certificate for youku.com expires on 2027-02-20.

The certificate for youku.com is issued by a third-party CA.

The certificate for youku.com uses an acceptable signature algorithm.

The certificate for youku.com uses an adequate ECC key of 256 bits.

The certificate for youku.com contains Signed Certificate Timestamps.

No known weak cipher suites detected on youku.com.

Domain youku.com expires on 2026-12-22.

Domain youku.com has clientTransferProhibited and clientDeleteProhibited locks.

MX records for youku.com do not match known disposable email provider patterns.

Domain youku.com was registered 2003-12-22.

No wildcard MX records detected for youku.com.

The .com TLD is not on known abuse watchlists.

DMARC rua/ruf addresses do not point to known URL shortener services.

No MX records point to known dynamic DNS service domains.

Primary MX (mx1.youku.com) uses TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 including Forward Secrecy.

DNS-based Safe Browsing lookup returned no results. Full verification requires the Google Safe Browsing API key.

Abuse contact information retrieved via abusix.org DNS lookup.

PhishTank phishing database check requires an API key.

Sender Score reputation check requires an API key.

Cisco Talos IP reputation check requires an API key.

HTTPS request to https://webmail.youku.com failed or timed out.

Registrar: Alibaba Cloud Computing (Beijing) Co., Ltd. | Created: 2003-12-22 | Expires: 2026-12-22 | Updated: 2025-12-22

Domain youku.com does not appear to have WHOIS privacy protection. Registrant details may be publicly visible.

Checking IPs against known bulletproof hosting providers requires a threat intelligence API key.

Checking domain against threat intelligence feeds requires API keys (e.g., VirusTotal, AbuseIPDB).

29 registered lookalike domain(s) that could be used for phishing against your brand. Showing top 5 of 29. Domains with MX records can send and receive email, making them high-risk phishing vectors.