Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
cityu.edu
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Did you mean: [email protected]
Checked via [email protected]
· 2026-03-21 05:42:48 UTC · ↺ Refresh
MX Hostnames
- cityu-edu.mail.protection.outlook.com
MX Priorities
- cityu-edu.mail.protection.outlook.com: 10
A / AAAA Records
- 35.215.75.102 ↩ 102.75.215.35.bc.googleusercontent.com
Mail Server IPs
- 52.101.41.22 ↩ mail-sj2pr05cu00406.inbound.protection.outlook.com
- 52.101.194.17 ↩ mail-ch5pr02cu00401.inbound.protection.outlook.com
- 52.101.9.20 ↩ mail-bl0pr02cu00604.inbound.protection.outlook.com
- 52.101.9.26 ↩ mail-bl0pr02cu00702.inbound.protection.outlook.com
- 2a01:111:f403:f90a:: ↩ mail-bn6pr02cu00300.inbound.protection.outlook.com
- 2a01:111:f403:c927::1 ↩ mail-bn8pr05cu00301.inbound.protection.outlook.com
- 2a01:111:f403:c801::1 ↩ mail-sn1pr0501cu00101.inbound.protection.outlook.com
- 2a01:111:f403:f90d::1 ↩ mail-sn1pr0501cu00301.inbound.protection.outlook.com
SOA Record
Raw SOA
ns1-09.azure-dns.com azuredns-hostmaster.microsoft.com 1 3600 300 2419200 300
Primary NS (mname)
ns1-09.azure-dns.com
Admin Email (rname)
azuredns-hostmaster@microsoft.com
Serial
1
Refresh
3600s
Retry
300s
Expire
2419200s
Minimum TTL
300s
Nameservers (NS)
ns5.changeip.com
ns1.changeip.com
ns4.changeip.com
ns2.changeip.com
ns6.changeip.com
ns3.changeip.com
SPF Record
✓ Strict (-all)
v=spf1 mx ip4:216.200.57.162 ip4:24.109.117.138 ip4:209.89.63.59 ip4:52.165.155.172 ip4:198.187.196.100 include:spf.protection.outlook.com include:spf-na.exlibrisgroup.com include:a._spf.brightspace.com include:spf.zohomail360.com -all
📊 DNS lookups: 6/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
~ Quarantine
v=DMARC1; p=quarantine; pct=100; aspf=r; adkim=r; rua=mailto:[email protected]; ruf=mailto:[email protected]; sp=reject; ri=604800;
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
↳ Subdomain policy: reject
DKIM Selectors
✓ 3 found
selector1._domainkey
selector2._domainkey
default._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
6 records- _rmw7a76lmnyeall3zs9wugberhoqm6u
- MS=ms34503872
- ZOOM_verify_AYqP4iwjzAGZyTX3BfAm08
- msfpkey=60aeklicql2ggjy3djnpqdt9v
- eVuzVoKv5KuekjZPTSdZNAu5+m1YmIM3vozf4W/w+nbH/Ug7BjBWIsOC8tWJnHap+5JSJDyfLb1GVNcpgqjCCg==
- SPFv=spf1 mx ip4:216.200.57.162 ip4:24.109.117.138 ip4:209.89.63.59 ip4:52.165.155.172 ip4:198.187.196.100 include:spf.protection.outlook.com include:spf-na.exlibrisgroup.com include:a._spf.brightspace.com include:spf.zohomail360.com -all
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