Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
esterling.co.uk
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Did you mean: [email protected]
Checked via [email protected]
· 2026-03-23 12:34:56 UTC · ↺ Refresh
MX Hostnames
- esterling-co-uk.p40.mxthunder.net
- esterling-co-uk.p20.mxthunder.net
- esterling-co-uk.p30.mxthunder.net
- esterling-co-uk.p10.mxthunder.com
MX Priorities
- esterling-co-uk.p30.mxthunder.net: 30
- esterling-co-uk.p40.mxthunder.net: 40
- esterling-co-uk.p10.mxthunder.com: 10
- esterling-co-uk.p20.mxthunder.net: 20
A / AAAA Records
- 172.67.171.193 (no PTR)
- 104.21.71.216 (no PTR)
- 2606:4700:3036::6815:47d8 (no PTR)
- 2606:4700:3036::ac43:abc1 (no PTR)
Mail Server IPs
- 209.41.68.240 ↩ bolt101b.mxthunder.net
- 108.166.161.243 ↩ bolt101a.mxthunder.net
SOA Record
Raw SOA
carioca.ns.cloudflare.com dns.cloudflare.com 2396859467 10000 2400 604800 1800
Primary NS (mname)
carioca.ns.cloudflare.com
Admin Email (rname)
dns@cloudflare.com
Serial
2396859467
Refresh
10000s
Retry
2400s
Expire
604800s
Minimum TTL
1800s
Nameservers (NS)
rocky.ns.cloudflare.com
carioca.ns.cloudflare.com
SPF Record
✓ Strict (-all)
v=spf1 include:spf.protection.outlook.com include:spf.esterling.co.uk -all
📊 DNS lookups: 2/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
~ Quarantine
v=DMARC1; p=quarantine; rua=mailto:[email protected]
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
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
5 records- MS=D52182A62E8D615B3420B8548F39E384848DFD63
- MS=ms36998987
- apple-domain-verification=uyTORPQGeoOiA7Y3TAUV0MTqoo9jimt03GCyTCAUD0I
- SPFv=spf1 include:spf.protection.outlook.com include:spf.esterling.co.uk -all
- yahoo-verification-key=dr6umSAB4yx8EexSYgrkcR6A4GoIZ2DCAt8gVL/z7b8=
Full email verification for esterling.co.uk
Run SMTP check, SPF/DKIM/DMARC and catch-all detection.
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