Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
columbiasouthern.edu
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-04-04 19:30:47 UTC · ↺ Refresh
MX Hostnames
- columbiasouthern0.mail.protection.outlook.com
MX Priorities
- columbiasouthern0.mail.protection.outlook.com: 10
A / AAAA Records
- 104.19.208.28 (no PTR)
Mail Server IPs
- 52.101.11.13 ↩ mail-sn1pr0501cu00205.inbound.protection.outlook.com
- 40.93.192.1 ↩ mail-dm5pr02cu00201.inbound.protection.outlook.com
- 52.101.10.2 ↩ mail-bn8pr03cu00202.inbound.protection.outlook.com
- 52.101.10.12 ↩ mail-bn1pr21cu00204.inbound.protection.outlook.com
- 2a01:111:f403:f902::1 ↩ mail-bl2pr02cu00101.inbound.protection.outlook.com
- 2a01:111:f403:f909:: ↩ mail-bn6pr04cu00200.inbound.protection.outlook.com
- 2a01:111:f403:c946::7 ↩ mail-ch5pr02cu00307.inbound.protection.outlook.com
- 2a01:111:f403:f90b:: ↩ mail-bn6pr04cu00100.inbound.protection.outlook.com
SOA Record
Raw SOA
ns1-08.azure-dns.com azuredns-hostmaster.microsoft.com 1 3600 300 2419200 300
Primary NS (mname)
ns1-08.azure-dns.com
Admin Email (rname)
azuredns-hostmaster@microsoft.com
Serial
1
Refresh
3600s
Retry
300s
Expire
2419200s
Minimum TTL
300s
Nameservers (NS)
ns4-08.azure-dns.info
ns1-08.azure-dns.com
ns2-08.azure-dns.net
ns3-08.azure-dns.org
SPF Record
✓ Strict (-all)
v=spf1 include:_spf1.columbiasouthern.edu include:_spf2.columbiasouthern.edu include:_spf3.columbiasouthern.edu include:_spf.smtp.mailtrap.live -all
📊 DNS lookups: 4/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✓ Reject
v=DMARC1; p=reject; rua=mailto:[email protected],mailto:[email protected],mailto:[email protected]; ruf=mailto:[email protected],mailto:[email protected];
✓ Reject — strongest protection
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected],mailto:[email protected],mailto:[email protected]
DKIM Selectors
✓ 4 found
selector1._domainkey
selector2._domainkey
s1._domainkey
s2._domainkey
✓ Public key: 392 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
13 records- google-site-verification=QxelCwW9Eyvxx8cjX2uOP_K4cMPtgYQ_0TDO1O7zT_g
- dell-technologies-domain-verification=columbiasouthern.edu_297e0416-5422-404b-8765-0d2de7981fc5_1760035136
- anthropic-domain-verification-tvge18=D8pU2uy9HQCFLi5rhkSYwY91b
- ZOOM_verify_gdXqvDtDw1xSGilNa6dJMQ
- atlassian-domain-verification=VJU6y8Yql646svArSh2uauWDVnBS5M9OjdJqtMV8pfV9rKFksfLzTgQl0ZU/lJMR
- MS=ms56090574
- 0NRvxQp7EexruJHvfLSw/EDN+2aiH4YOYJyHyvKd2uiMeuqeqGmyvxr0ydciBMMGggptIWQUTepr/upzHvquBw==
- dropbox-domain-verification=yru0qc7xajmc
- SPFv=spf1 include:_spf1.columbiasouthern.edu include:_spf2.columbiasouthern.edu include:_spf3.columbiasouthern.edu include:_spf.smtp.mailtrap.live -all
- apple-domain-verification=e0MYfTAqxq5WSiDA
- facebook-domain-verification=h7pxih7piwjo8x8jwmxy1k7b9sy6qi
- FLGsp+a2I6I+H5w1UTn9VoIT37seeMolff0CqE/oIKkFrr2WIaSynLW+/EEA02p3viyq0wZUNx5bu5k3Mgobnw==
- ZOOM17865706
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