Live data — DNS records and disposable check were just fetched and saved.
Domain Overview
DNS: ⚡ live
Checker: ⚡ live
castertech.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-05-20 21:13:24 UTC · ↺ Refresh
MX Hostnames
- castertech-com.mail.protection.outlook.com
MX Priorities
No priority data.
A / AAAA Records
- 172.235.62.46
Mail Server IPs
No IPs resolved.
SOA Record
No SOA record found.
Nameservers (NS)
ns4-02.azure-dns.info
ns1-02.azure-dns.com
ns2-02.azure-dns.net
ns3-02.azure-dns.org
SPF Record
✓ Strict (-all)
v=spf1 include:_u.castertech.com._spf.dmarclb.com include:spf.protection.outlook.com -all
📊 DNS lookups: 2/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
~ Quarantine
v=DMARC1; p=quarantine; rua=mailto:[email protected]; ruf=mailto:[email protected]; sp=reject; adkim=s; aspf=s; pct=100; fo=0;
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Strict
· DKIM alignment: Strict
📧 Reports → mailto:[email protected]
↳ Subdomain policy: reject
DKIM Selectors
✓ 5 found
selector1._domainkey
selector2._domainkey
k1._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
3 records- SPFv=spf1 include:_u.castertech.com._spf.dmarclb.com include:spf.protection.outlook.com -all
- ZOOM_verify_jwX9FBh0K4Yxwym7i1AGTP
- MS=ms31555104
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