Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
ruc.edu.cn
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Did you mean: [email protected]
Checked via [email protected]
· 2026-03-19 16:21:25 UTC · ↺ Refresh
MX Hostnames
- hzmx01.mxmail.netease.com
- hzmx02.mxmail.netease.com
MX Priorities
- hzmx01.mxmail.netease.com: 5
- hzmx02.mxmail.netease.com: 10
A / AAAA Records
- 222.29.216.11 (no PTR)
Mail Server IPs
- 47.90.150.166 (no PTR)
- 47.253.119.154 (no PTR)
SOA Record
Raw SOA
ns.ruc.edu.cn noc.ruc.edu.cn 53 18000 300 86400 3600
Primary NS (mname)
ns.ruc.edu.cn
Admin Email (rname)
noc@ruc.edu.cn
Serial
53
Refresh
18000s
Retry
300s
Expire
86400s
Minimum TTL
3600s
Nameservers (NS)
ns1.ruc.edu.cn
ns3.ruc.edu.cn
dns1.ruc.edu.cn
ns2.ruc.edu.cn
dns2.ruc.edu.cn
SPF Record
✓ Strict (-all)
v=spf1 include:spf.163.com -all
📊 DNS lookups: 1/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
~ Quarantine
v=DMARC1; p=quarantine; fo=1; ruf=mailto:[email protected]; rua=mailto:[email protected]
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
DKIM Selectors
✓ 1 found
default._domainkey
✓ Public key: 216 chars (valid)
✓ DKIM properly configured for selector: default
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
1 record- SPFv=spf1 include:spf.163.com -all
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