🌐DNS
1 A · 2 MX · 2 NS · 1 SOA · 2 TXT
🔒SSL/TLS
DigiCert Inc · TLSv1.3 · expires in 197d · 2 SANs
✉️Email Auth
SPF ✓ · DKIM ✗ · DMARC ✗ (p=none)
💻Tech Stack
Host: China Education and Research Network Center · Email: Self-hosted
📡HTTP
1 redirect → 200 · HSTS ✗ · CSP ✗ · X-Frame ✗ · Nosniff ✗
🛡️Security
C (150/225) · 1 critical · 3 high
📈Deliverability
F (30/100) · 0 MX · 0 IPs · 3 issue(s)
🔍Subdomains
10 found · 113 answered — en, imap, mail, media, pop, pop3 +4 more
📚Web Archive
no snapshots found