cugb.edu.cn

Valid Email Server
Domain Lookup › cugb.edu.cn

Domain Overview

DNS: ✓ 2mo ago Checker: ✓ 2mo ago
cugb.edu.cn
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Did you mean: [email protected]

Checked via [email protected] · 2026-03-18 11:29:58 UTC · ↺ Refresh

MX Hostnames

  • mail.cugb.edu.cn

MX Priorities

  • mail.cugb.edu.cn: 5

A / AAAA Records

  • 202.204.105.5 ↩ dns.cugb.edu.cn
  • 202.204.105.1 ↩ ring.cugb.edu.cn
  • ::1 ↩ localhost

Mail Server IPs

  • 202.204.105.6 ↩ mail.cugb.edu.cn

SOA Record

Raw SOA ring.cugb.edu.cn root.cugb.edu.cn 2100002170 86400 3600 604800 10800
Primary NS (mname)
ring.cugb.edu.cn
Admin Email (rname)
root@cugb.edu.cn
Serial
2100002170
Refresh
86400s
Retry
3600s
Expire
604800s
Minimum TTL
10800s

Nameservers (NS)

dns.cugb.edu.cn
ring.cugb.edu.cn

SPF Record

✓ Strict (-all)
v=spf1 ip4:202.204.105.6/24 -all
📊 DNS lookups: 0/10
✓ Hard fail (-all) — strict enforcement

DMARC Record

✗ Missing

No DMARC record — emails cannot be rejected on auth failure.

DKIM Selectors

✗ None detected

No DKIM records found for common selectors — your provider may use a custom selector name.

Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses

All TXT Records

2 records
  • SPFv=spf1 ip4:202.204.105.6/24 -all
  • MS=EFBAC9E61F1B16F8B21902BB1A0A74E8E61B776D
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