theone21.com

Valid Email Server
Domain Lookup › theone21.com

Domain Overview

DNS: ✓ 2mo ago Checker: ✓ 2mo ago
theone21.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No

Checked via [email protected] · 2026-03-25 02:10:42 UTC · ↺ Refresh

MX Hostnames

  • theone21-com.mail.protection.outlook.com

MX Priorities

  • theone21-com.mail.protection.outlook.com: 0

A / AAAA Records

  • 34.198.39.61 ↩ ec2-34-198-39-61.compute-1.amazonaws.com
  • 44.205.25.152 ↩ ec2-44-205-25-152.compute-1.amazonaws.com

Mail Server IPs

  • 52.101.42.18 ↩ mail-co1pr03cu00302.inbound.protection.outlook.com
  • 52.101.50.4 ↩ mail-co1pr03cu00404.inbound.protection.outlook.com
  • 52.101.8.42 ↩ mail-dm6pr03cu00402.inbound.protection.outlook.com
  • 52.101.11.17 ↩ mail-sn1pr0501cu00301.inbound.protection.outlook.com
  • 2a01:111:f403:c946::7 ↩ mail-ch5pr02cu00307.inbound.protection.outlook.com
  • 2a01:111:f403:c91d::b ↩ mail-mw2pr02cu00603.inbound.protection.outlook.com
  • 2a01:111:f403:f90f::1 ↩ mail-sa9pr04cu00201.inbound.protection.outlook.com
  • 2a01:111:f403:f802::3 ↩ mail-sj0pr03cu01403.inbound.protection.outlook.com

SOA Record

Raw SOA ns.collegextra.com awsdns-hostmaster.amazon.com 1 7200 900 1209600 86400
Primary NS (mname)
ns.collegextra.com
Admin Email (rname)
awsdns-hostmaster@amazon.com
Serial
1
Refresh
7200s
Retry
900s
Expire
1209600s
Minimum TTL
86400s

Nameservers (NS)

ns.collegextra.com
ns.collegextra.net

SPF Record

✓ Soft Fail (~all)
v=spf1 include:spf.protection.outlook.com include:_spf.google.com include:mailgun.org ~all
📊 DNS lookups: 3/10
~ Soft fail (~all) — moderate enforcement

DMARC Record

✗ Missing

No DMARC record — emails cannot be rejected on auth failure.

DKIM Selectors

✗ None detected

No DKIM records found for common selectors — your provider may use a custom selector name.

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

All TXT Records

3 records
  • google-site-verification=NYc0SlI23qyFG4jx9gFO5sJ8b6koi20DWy8vvgdC-to
  • openai-domain-verification=dv-E90XDwwgc4i17pTdDSjZsdYE
  • SPFv=spf1 include:spf.protection.outlook.com include:_spf.google.com include:mailgun.org ~all
Full email verification for theone21.com

Run SMTP check, SPF/DKIM/DMARC and catch-all detection.

SPF / DKIM / DMARC Get 1,000 Free Credits