duffbuilders.com

Valid Email Server
Domain Lookup › duffbuilders.com

Domain Overview

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

Checked via [email protected] · 2026-03-19 18:49:29 UTC · ↺ Refresh

MX Hostnames

  • duffbuilders-com.mail.protection.outlook.com

MX Priorities

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

A / AAAA Records

  • 162.159.135.42 (no PTR)

Mail Server IPs

  • 52.101.11.7 ↩ mail-sa9pr04cu00107.inbound.protection.outlook.com
  • 52.101.10.5 ↩ mail-bn6pr04cu00105.inbound.protection.outlook.com
  • 52.101.194.13 ↩ mail-ch0pr04cu00605.inbound.protection.outlook.com
  • 52.101.11.13 ↩ mail-sn1pr0501cu00205.inbound.protection.outlook.com
  • 2a01:111:f403:f90a:: ↩ mail-bn6pr02cu00300.inbound.protection.outlook.com
  • 2a01:111:f403:c802:: ↩ mail-cy4pr03cu00100.inbound.protection.outlook.com
  • 2a01:111:f403:c931:: ↩ mail-sn1pr02cu00100.inbound.protection.outlook.com
  • 2a01:111:f403:f901:: ↩ mail-mn2pr04cu00200.inbound.protection.outlook.com

SOA Record

Raw SOA ns1.anchor.host dns.constellix.com 2015010120 43200 3600 1209600 180
Primary NS (mname)
ns1.anchor.host
Admin Email (rname)
dns@constellix.com
Serial
2015010120
Refresh
43200s
Retry
3600s
Expire
1209600s
Minimum TTL
180s

Nameservers (NS)

ns4.anchor.host
ns1.anchor.host
ns2.anchor.host
ns3.anchor.host

SPF Record

✓ Soft Fail (~all)
v=spf1 ip4:75.151.143.201 include:spf.protection.outlook.com ~all
📊 DNS lookups: 1/10
~ 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

4 records
  • ppe-304b61836bcde8a02f1b9da99a359eed3cb920fe
  • ca3-b02369413b9d4b19be5e1ae75f286242
  • SPFv=spf1 ip4:75.151.143.201 include:spf.protection.outlook.com ~all
  • MS=ms46812625
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