Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
trinityheatingcooling.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-24 00:30:10 UTC · ↺ Refresh
MX Hostnames
- trinityheatingcooling-com.mail.protection.outlook.com
MX Priorities
- trinityheatingcooling-com.mail.protection.outlook.com: 10
A / AAAA Records
- 185.58.213.84 (no PTR)
Mail Server IPs
- 52.101.10.8 ↩ mail-bn1pr04cu00100.inbound.protection.outlook.com
- 52.101.41.56 ↩ mail-sj0pr21cu00100.inbound.protection.outlook.com
- 52.101.8.44 ↩ mail-dm5pr04cu00104.inbound.protection.outlook.com
- 52.101.40.6 ↩ mail-cy1pr03cu00106.inbound.protection.outlook.com
- 2a01:111:f403:f903:: (no PTR)
- 2a01:111:f403:f902::1 ↩ mail-bl2pr02cu00101.inbound.protection.outlook.com
- 2a01:111:f403:f804::3 ↩ mail-co1pr03cu00403.inbound.protection.outlook.com
- 2a01:111:f403:f802:: ↩ mail-byapr05cu00400.inbound.protection.outlook.com
SOA Record
Raw SOA
ns1.mdnsservice.com hostmaster.mdnsservice.com 207123154 10001 7200 2419200 300
Primary NS (mname)
ns1.mdnsservice.com
Admin Email (rname)
hostmaster@mdnsservice.com
Serial
207123154
Refresh
10001s
Retry
7200s
Expire
2419200s
Minimum TTL
300s
Nameservers (NS)
ns1.mdnsservice.com
ns2.mdnsservice.com
ns3.mdnsservice.com
SPF Record
✓ Strict (-all)
v=spf1 include:spf.protection.outlook.com -all
📊 DNS lookups: 1/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✗ MissingNo DMARC record — emails cannot be rejected on auth failure.
DKIM Selectors
✗ None detectedNo 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
1 record- SPFv=spf1 include:spf.protection.outlook.com -all
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