Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
holtconstruction.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-18 17:11:14 UTC · ↺ Refresh
MX Hostnames
- holtconstruction-com.mail.protection.outlook.com
MX Priorities
- holtconstruction-com.mail.protection.outlook.com: 0
A / AAAA Records
- 198.185.159.144 (no PTR)
Mail Server IPs
- 52.101.41.21 ↩ mail-sj2pr05cu00305.inbound.protection.outlook.com
- 52.101.194.17 ↩ mail-ch5pr02cu00401.inbound.protection.outlook.com
- 52.101.8.34 ↩ mail-dm2pr04cu00102.inbound.protection.outlook.com
- 52.101.194.15 ↩ mail-ch4pr21cu00107.inbound.protection.outlook.com
- 2a01:111:f403:f913::1 ↩ mail-cy5pr05cu00101.inbound.protection.outlook.com
- 2a01:111:f403:f903:: (no PTR)
- 2a01:111:f403:c903::3 ↩ mail-mw2pr02cu00503.inbound.protection.outlook.com
- 2a01:111:f403:f910:: ↩ mail-cy5pr03cu00300.inbound.protection.outlook.com
SOA Record
Raw SOA
dns105.register.com root.register.com 125041615 10800 3600 604800 3600
Primary NS (mname)
dns105.register.com
Admin Email (rname)
root@register.com
Serial
125041615
Refresh
10800s
Retry
3600s
Expire
604800s
Minimum TTL
3600s
Nameservers (NS)
dns105.register.com
dns106.register.com
SPF Record
✓ Strict (-all)
v=spf1 include:spf.protection.outlook.com +include:spfa.cpmails.com +a +mx +ip4:192.249.120.166 +ip4:192.168.0.240 +include:smtp-relay.proxurve.com include:spf-us.emailsignatures365.com -all
📊 DNS lookups: 6/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
~ Quarantine
v=DMARC1; p=quarantine; rua=mailto:[email protected]
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
DKIM Selectors
✓ 2 found
selector1._domainkey
selector2._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
2 records- SPFv=spf1 include:spf.protection.outlook.com +include:spfa.cpmails.com +a +mx +ip4:192.249.120.166 +ip4:192.168.0.240 +include:smtp-relay.proxurve.com include:spf-us.emailsignatures365.com -all
- apple-domain-verification=Ch1HYcwsiBxiW88n
Full email verification for holtconstruction.com
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