sierracol.com

Valid Email Server
Domain Lookup › sierracol.com
Live data — DNS records and disposable check were just fetched and saved.

Domain Overview

DNS: ⚡ live Checker: ⚡ live
sierracol.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No

Checked via [email protected] · 2026-05-21 04:45:22 UTC · ↺ Refresh

MX Hostnames

  • sierracol-com.mail.protection.outlook.com

MX Priorities

No priority data.

A / AAAA Records

  • 3.213.5.122
  • 15.197.142.173
  • 3.33.152.147

Mail Server IPs

No IPs resolved.

SOA Record

No SOA record found.

Nameservers (NS)

ns72.domaincontrol.com
ns71.domaincontrol.com

SPF Record

✓ Strict (-all)
v=spf1 include:spf.protection.outlook.com include:_spf-ip4a.sierracol.com include:_spf-ip4b.sierracol.com -all
📊 DNS lookups: 3/10
✓ Hard fail (-all) — strict enforcement

DMARC Record

~ Quarantine
v=DMARC1; p=quarantine; sp=quarantine; adkim=s; aspf=s; rua=mailto:[email protected]; ruf= mailto:[email protected]; rf=afrf; pct=100; ri=86400; fo=1
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Strict · DKIM alignment: Strict
📧 Reports → mailto:[email protected]
↳ Subdomain policy: quarantine

DKIM Selectors

✓ 4 found
selector1._domainkey
selector2._domainkey
s1._domainkey
s2._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

9 records
  • google-site-verification=SqdGHnPjHQjQzjhVSmxLGbeElziDDSABMRUXJLE-0bc
  • SPFv=spf1 include:spf.protection.outlook.com include:_spf-ip4a.sierracol.com include:_spf-ip4b.sierracol.com -all
  • globalsign-domain-verification=993F7B516B9A15E82335A958B8CAFE0A
  • MS=ms57333904
  • google-gws-recovery-domain-verification=55887051
  • Successfactors-site-verification=ZWI0Njc3ODBkNTY2Y2NmMmJhODc0YmU2MzcxYTI3ZGRmNWE1ZDdhMmVjNjE3NzljNGU1MjY1Nzg4ODc1OWZjYg==
  • apple-domain-verification=xf8oCpDTsPNa4Axs
  • globalsign-domain-verification=EEF8D1AD6BB2C65236BAE6143F0944E9
  • MS=ms79423392
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