Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
sierrabuildingscience.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-20 16:33:09 UTC · ↺ Refresh
MX Hostnames
- sierrabuildingscience-com.mail.protection.outlook.com
MX Priorities
- sierrabuildingscience-com.mail.protection.outlook.com: 0
A / AAAA Records
- 13.248.243.5 ↩ a16e665f42988324c.awsglobalaccelerator.com
- 76.223.105.230 ↩ a16e665f42988324c.awsglobalaccelerator.com
Mail Server IPs
- 52.101.9.0 ↩ mail-bl2pr02cu00100.inbound.protection.outlook.com
- 52.101.41.21 ↩ mail-sj2pr05cu00305.inbound.protection.outlook.com
- 52.101.50.13 ↩ mail-mw2pr02cu00605.inbound.protection.outlook.com
- 52.101.8.51 ↩ mail-dm1pr04cu00203.inbound.protection.outlook.com
- 2a01:111:f403:f805::1 ↩ mail-co1pr03cu00301.inbound.protection.outlook.com
- 2a01:111:f403:f90d::1 ↩ mail-sn1pr0501cu00301.inbound.protection.outlook.com
- 2a01:111:f403:c802:: ↩ mail-cy4pr03cu00100.inbound.protection.outlook.com
- 2a01:111:f403:f802::3 ↩ mail-sj0pr03cu01403.inbound.protection.outlook.com
SOA Record
Raw SOA
ns41.domaincontrol.com dns.jomax.net 2024091600 28800 7200 604800 3600
Primary NS (mname)
ns41.domaincontrol.com
Admin Email (rname)
dns@jomax.net
Serial
2024091600
Refresh
28800s
Retry
7200s
Expire
604800s
Minimum TTL
3600s
Nameservers (NS)
ns41.domaincontrol.com
ns42.domaincontrol.com
SPF Record
✓ Strict (-all)
v=spf1 include:secureserver.net -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
2 records- SPFv=spf1 include:secureserver.net -all
- NETORGFT7694558.onmicrosoft.com
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