cuhk.edu.hk

Valid Email Server
Domain Lookup › cuhk.edu.hk

Domain Overview

DNS: ✓ 11d ago Checker: ✓ 11d ago
cuhk.edu.hk
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Did you mean: [email protected]

Checked via [email protected] · 2026-05-20 19:31:14 UTC · ↺ Refresh

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MX Hostnames

  • cuhk-st.in.tmes.trendmicro.com

MX Priorities

  • cuhk-st.in.tmes.trendmicro.com: 5

A / AAAA Records

  • 27.126.235.25 (no PTR)

Mail Server IPs

  • 18.208.22.78 ↩ in.tmes.trendmicro.com
  • 18.208.22.80 ↩ in.tmes.trendmicro.com
  • 18.208.22.77 ↩ in.tmes.trendmicro.com
  • 18.208.22.79 ↩ in.tmes.trendmicro.com

SOA Record

Raw SOA ddi-gm1.itsc.cuhk.edu.hk hostmaster.cuhk.edu.hk 201704460 600 300 1814400 300
Primary NS (mname)
ddi-gm1.itsc.cuhk.edu.hk
Admin Email (rname)
hostmaster@cuhk.edu.hk
Serial
201704460
Refresh
600s
Retry
300s
Expire
1814400s
Minimum TTL
300s

Nameservers (NS)

dns3.cuhk.edu.hk
ns4.gdnsdef.com
dns2.cuhk.edu.hk
ns4.gdnsec.com
anyns.cuhk.edu.hk
dns1.cuhk.edu.hk

SPF Record

✓ Strict (-all)
v=spf1 include:spf.protection.outlook.com include:spfe.itsc.cuhk.edu.hk include:spftmems.itsc.cuhk.edu.hk ip4:137.189.0.0/16 ip4:123.255.65.0/24 ip6:2405:3000:3::/48 -all
📊 DNS lookups: 3/10
✓ Hard fail (-all) — strict enforcement

DMARC Record

✗ p=none
v=DMARC1; p=none; adkim=s; aspf=s
⚠ p=none — monitoring only, no enforcement
📋 SPF alignment: Strict · DKIM alignment: Strict
⚠ No aggregate reports (rua= not set)

DKIM Selectors

✓ 2 found
selector1._domainkey
selector2._domainkey
✓ Public key: 216 chars (valid)
✓ DKIM properly configured for selector: selector1

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

All TXT Records

5 records
  • h5WA8UpWGJWDLyxQvxpOC9isc0019te/wKy9xGdID77RbUkXS9N0BgPvNtPd2KKg9JMjbG1jIUFrrrrTGKi9DQ==
  • adobe-idp-site-verification=7fc23f51ce60adec0d8796a683914ba1167fb49fc42d8889fa7416ba4927079c
  • SPFv=spf1 include:spf.protection.outlook.com include:spfe.itsc.cuhk.edu.hk include:spftmems.itsc.cuhk.edu.hk ip4:137.189.0.0/16 ip4:123.255.65.0/24 ip6:2405:3000:3::/48 -all
  • Foxit-domain-verification=7b63330972e6429e349104a11a97ec34
  • google-site-verification=cGTxUZkK1PBJ2dmfxNmtS9Q3n1XNb2qwvVyQkIrq9CA
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