Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
sterlingboiler.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-20 00:18:56 UTC · ↺ Refresh
MX Hostnames
- sterlingboiler-com.mail.protection.outlook.com
MX Priorities
- sterlingboiler-com.mail.protection.outlook.com: 1
A / AAAA Records
- 205.178.189.129 ↩ underconstruction.networksolutions.com
Mail Server IPs
- 52.101.11.13 ↩ mail-sn1pr0501cu00205.inbound.protection.outlook.com
- 52.101.41.4 ↩ mail-sj2pr05cu00204.inbound.protection.outlook.com
- 52.101.42.16 ↩ mail-co1pr05cu00300.inbound.protection.outlook.com
- 52.101.194.3 ↩ mail-ch1pr04cu00103.inbound.protection.outlook.com
- 2a01:111:f403:c92c::2 ↩ mail-dm2pr04cu00102.inbound.protection.outlook.com
- 2a01:111:f403:f902::2 ↩ mail-mn2pr02cu00202.inbound.protection.outlook.com
- 2a01:111:f403:f802::2 ↩ mail-sj2pr05cu00202.inbound.protection.outlook.com
- 2a01:111:f403:f901::2 ↩ mail-bl2pr02cu00402.inbound.protection.outlook.com
SOA Record
Raw SOA
ns53.worldnic.com namehost.worldnic.com 125021510 10800 3600 604800 3600
Primary NS (mname)
ns53.worldnic.com
Admin Email (rname)
namehost@worldnic.com
Serial
125021510
Refresh
10800s
Retry
3600s
Expire
604800s
Minimum TTL
3600s
Nameservers (NS)
ns54.worldnic.com
ns53.worldnic.com
SPF Record
✓ Strict (-all)
v=spf1 ip4:131.106.199.133 ip4:66.228.55.144 include:spf.protection.outlook.com include:spf.ess.barracudanetworks.com include:spfext.zapproved.com -all
📊 DNS lookups: 3/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✗ p=none
v=DMARC1; p=none; fo=1; rua=mailto:[email protected]; ruf=mailto:[email protected]
⚠ p=none — monitoring only, no enforcement
📋 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
8 records- hbvuji1jue9rmmhmbmm3fam8s7
- sentinel_id=ic1sHaXLfH
- SPFv=spf1 ip4:131.106.199.133 ip4:66.228.55.144 include:spf.protection.outlook.com include:spf.ess.barracudanetworks.com include:spfext.zapproved.com -all
- knowbe4-site-verification=2071ce5929f75969e8b2cc2a9fcb9803
- MS=ms14183912
- 2g4m6t0hajofk0onnfopskqq3j
- qjkfaugvd84ml669qmf1eonimq
- dv7vpYOAGfCnoJIrqd0o/Zb9jg5ict6IC2S9xBkAxQTBJUanb+6xeaOUs1jLqo4+qyG24SKxo+Z4HNeOO9rGwA==
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