horizonbuilders.com

Valid Email Server
Domain Lookup › horizonbuilders.com

Domain Overview

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

Checked via [email protected] · 2026-03-19 14:43:10 UTC · ↺ Refresh

MX Hostnames

  • mx3c28.carrierzone.com
  • mx1c28.carrierzone.com
  • mx4c28.carrierzone.com
  • horizonbuilders-com.mail.protection.outlook.com
  • mx2c28.carrierzone.com

MX Priorities

  • mx1c28.carrierzone.com: 10
  • mx4c28.carrierzone.com: 120
  • horizonbuilders-com.mail.protection.outlook.com: 0
  • mx3c28.carrierzone.com: 110
  • mx2c28.carrierzone.com: 100

A / AAAA Records

  • 66.226.70.9

Mail Server IPs

  • 66.226.70.78 ↩ mx1c28.carrierzone.com
  • 66.226.70.73 ↩ mx4c28.carrierzone.com
  • 52.101.8.34 ↩ mail-dm2pr04cu00102.inbound.protection.outlook.com
  • 52.101.9.24 ↩ mail-bl2pr02cu00400.inbound.protection.outlook.com
  • 52.101.10.6 ↩ mail-bn1pr21cu00106.inbound.protection.outlook.com
  • 52.101.50.7 ↩ mail-co1pr21cu00207.inbound.protection.outlook.com
  • 2a01:111:f403:f908::1 ↩ mail-bn1pr04cu00101.inbound.protection.outlook.com
  • 2a01:111:f403:c927::1 ↩ mail-bn8pr05cu00301.inbound.protection.outlook.com
  • 2a01:111:f403:c802:: ↩ mail-cy4pr03cu00100.inbound.protection.outlook.com
  • 2a01:111:f403:f804::2 ↩ mail-co1pr05cu00402.inbound.protection.outlook.com
  • 66.226.70.72
  • 66.226.70.79

SOA Record

Raw SOA ns1.carrierzone.com postmaster.carrierzone.com 2024020214 86400 86400 3600000 86400
Primary NS (mname)
ns1.carrierzone.com
Admin Email (rname)
postmaster@carrierzone.com
Serial
2024020214
Refresh
86400s
Retry
86400s
Expire
3600000s
Minimum TTL
86400s

Nameservers (NS)

ns1.carrierzone.com
ns3.carrierzone.com
ns2.carrierzone.com
ns4.carrierzone.com

SPF Record

✓ Strict (-all)
v=spf1 include:spf.protection.outlook.com -all
📊 DNS lookups: 1/10
✓ Hard fail (-all) — strict 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

2 records
  • SPFv=spf1 include:spf.protection.outlook.com -all
  • SPFv=spf1 a mx include:spfc28.carrierzone.com ~all
Full email verification for horizonbuilders.com

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

SPF / DKIM / DMARC Get 1,000 Free Credits