Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
pku.edu.cn
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Did you mean: [email protected]
Checked via [email protected]
· 2026-03-20 12:50:51 UTC · ↺ Refresh
MX Hostnames
- gateway.pku.edu.cn
- mx-pku-edu-cn.icoremail.net
MX Priorities
- mx-pku-edu-cn.icoremail.net: 5
- gateway.pku.edu.cn: 10
A / AAAA Records
- 162.105.131.160 (no PTR)
Mail Server IPs
- 152.32.185.215 ↩ ucloud-cmmxproxy.icoremail.net
- 152.32.234.63 ↩ ucloud-cmmxproxy.icoremail.net
- 162.105.129.123 ↩ gateway.pku.edu.cn
SOA Record
Raw SOA
ns.pku.edu.cn hostmaster.pku.edu.cn 2026032002 3600 300 86400 3600
Primary NS (mname)
ns.pku.edu.cn
Admin Email (rname)
hostmaster@pku.edu.cn
Serial
2026032002
Refresh
3600s
Retry
300s
Expire
86400s
Minimum TTL
3600s
Nameservers (NS)
dns1.pku.edu.cn
dns2.pku.edu.cn
ns.pku.edu.cn
SPF Record
✓ Strict (-all)
v=spf1 ip4:162.105.129.0/24 include:spf.icoremail.net -all
📊 DNS lookups: 1/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✗ p=none
v=DMARC1; p=none; ruf=mailto:[email protected]; rua=mailto:[email protected]
⚠ p=none — monitoring only, no enforcement
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
DKIM Selectors
✓ 1 found
dkim._domainkey
✓ Public key: 216 chars (valid)
✓ DKIM properly configured for selector: dkim
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
2 records- _hzos8v1tcdrxo5uk1i5qyl7pnu7w15x
- SPFv=spf1 ip4:162.105.129.0/24 include:spf.icoremail.net -all
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