Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
sierraexperts.com
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-04-01 08:23:31 UTC · ↺ Refresh
MX Hostnames
- mx-cluster-usa01.hornetsecurity.com
- mx-cluster-usa02.hornetsecurity.com
- mx-cluster-usa04.hornetsecurity.com
- mx-cluster-usa03.hornetsecurity.com
MX Priorities
- mx-cluster-usa01.hornetsecurity.com: 10
- mx-cluster-usa03.hornetsecurity.com: 30
- mx-cluster-usa02.hornetsecurity.com: 20
- mx-cluster-usa04.hornetsecurity.com: 40
A / AAAA Records
- 38.107.149.203 ↩ SIERR001-2.sierradevops.com
Mail Server IPs
- 173.45.18.100 ↩ hsmx01-hz5.hornetsecurity.com
SOA Record
Raw SOA
ns01.sierradc.com hostmaster.sierrawowires.com 2016021453 7200 2700 86400 14400
Primary NS (mname)
ns01.sierradc.com
Admin Email (rname)
hostmaster@sierrawowires.com
Serial
2016021453
Refresh
7200s
Retry
2700s
Expire
86400s
Minimum TTL
14400s
Nameservers (NS)
ns01.sierradc.com
ns03.sierradc.com
ns02.sierradc.com
ns04.sierradc.com
SPF Record
✗ MissingNo SPF record — domain is unprotected against spoofing.
⚠ No SPF record found. Email servers cannot verify authorized senders.
DMARC Record
~ Quarantine
v=DMARC1; p=quarantine; pct=100; ruf=mailto:[email protected]; rua=mailto:[email protected]; adkim=r; aspf=r
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
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
No TXT records found.
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