🌐DNS
3 A · 2 MX · 3 NS · 3 PTR · 1 SOA · 3 TXT
🔒SSL/TLS
GlobalSign nv-sa · TLSv1.3 · expires in 269d · 6 SANs
✉️Email Auth
SPF ✓ · DKIM ✗ · DMARC ✗
💻Tech Stack
Host: China Education and Research Network Center · Email: Self-hosted
📡HTTP
HTTP 200 · HSTS ✓ · CSP ✗ · X-Frame ✗ · Nosniff ✗
🛡️Security
C (150/215) · 1 critical · 2 high
📈Deliverability
B (64/90) · 2 MX · 5 IPs · 5 issue(s)
🔍Subdomains
7 found · 105 answered (7 timed out) — email, en, imap, mail, pop3, smtp +1 more