Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
gc3builders.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-23 18:28:40 UTC · ↺ Refresh
MX Hostnames
- gc3builders-com.mail.protection.outlook.com
MX Priorities
- gc3builders-com.mail.protection.outlook.com: 0
A / AAAA Records
- 104.21.81.178 (no PTR)
- 172.67.145.138 (no PTR)
- 2606:4700:3030::6815:51b2
- 2606:4700:3036::ac43:918a
Mail Server IPs
- 52.101.41.24 ↩ mail-sj0pr03cu01600.inbound.protection.outlook.com
- 52.101.40.24 ↩ mail-cy5pr05cu00100.inbound.protection.outlook.com
- 52.101.8.42 ↩ mail-dm6pr03cu00402.inbound.protection.outlook.com
- 52.101.50.13 ↩ mail-mw2pr02cu00605.inbound.protection.outlook.com
- 2a01:111:f403:f804::1 ↩ mail-co1pr05cu00301.inbound.protection.outlook.com
- 2a01:111:f403:f902:: ↩ mail-bl2pr04cu00100.inbound.protection.outlook.com
- 2a01:111:f403:f90d:: ↩ mail-sn1pr0501cu00200.inbound.protection.outlook.com
- 2a01:111:f403:f908:: ↩ mail-bn1pr21cu00100.inbound.protection.outlook.com
SOA Record
Raw SOA
heather.ns.cloudflare.com dns.cloudflare.com 2396230898 10000 2400 604800 1800
Primary NS (mname)
heather.ns.cloudflare.com
Admin Email (rname)
dns@cloudflare.com
Serial
2396230898
Refresh
10000s
Retry
2400s
Expire
604800s
Minimum TTL
1800s
Nameservers (NS)
heather.ns.cloudflare.com
kevin.ns.cloudflare.com
SPF Record
✓ Strict (-all)
v=spf1 ip4:216.81.212.53 include:spf.protection.outlook.com include:servers.mcsv.net -all
📊 DNS lookups: 2/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
~ Quarantine
v=DMARC1; pct=100; p=quarantine
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
⚠ No aggregate reports (rua= not set)
DKIM Selectors
✓ 2 found
selector1._domainkey
selector2._domainkey
✓ DKIM properly configured for selector: selector1
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
4 records- adobe-idp-site-verification=bd734050efe130f71cbf7cb73d6a2d956746a6cedbaee256be5644c4d0f36c91
- cisco-ci-domain-verification=c3174ec58c4c001c9000702c76565984715289f6c52ce638023765f75e726d
- SPFv=spf1 ip4:216.81.212.53 include:spf.protection.outlook.com include:servers.mcsv.net -all
- 6982ae4d62908f608e8d1e35bcd6f5f
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