Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
firstclassairsupport.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-18 17:17:56 UTC · ↺ Refresh
MX Hostnames
- firstclassairsupport-com.mail.protection.outlook.com
MX Priorities
- firstclassairsupport-com.mail.protection.outlook.com: 5
A / AAAA Records
- 104.21.61.14 (no PTR)
- 172.67.204.222 (no PTR)
- 2606:4700:3035::6815:3d0e (no PTR)
- 2606:4700:3031::ac43:ccde (no PTR)
Mail Server IPs
- 52.101.194.15 ↩ mail-ch4pr21cu00107.inbound.protection.outlook.com
- 52.101.40.0 ↩ mail-cy5pr03cu00300.inbound.protection.outlook.com
- 52.101.41.180 ↩ mail-byapr04cu00204.inbound.protection.outlook.com
- 52.101.10.8 ↩ mail-bn1pr04cu00100.inbound.protection.outlook.com
SOA Record
Raw SOA
elma.ns.cloudflare.com dns.cloudflare.com 2398123891 10000 2400 604800 1800
Primary NS (mname)
elma.ns.cloudflare.com
Admin Email (rname)
dns@cloudflare.com
Serial
2398123891
Refresh
10000s
Retry
2400s
Expire
604800s
Minimum TTL
1800s
Nameservers (NS)
rodney.ns.cloudflare.com
elma.ns.cloudflare.com
SPF Record
✓ Strict (-all)
v=spf1 include:spf.protection.outlook.com -all
📊 DNS lookups: 1/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✓ Reject
v=DMARC1; p=reject; rua=mailto:[email protected];
✓ Reject — strongest protection
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
DKIM Selectors
✓ 2 found
selector1._domainkey
selector2._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- logmein-verification-code=7onlQZXUW3cOZad8hVvPE00fq
- SPFv=spf1 include:spf.protection.outlook.com -all
- MS=ms56313629
- MS=ms96147050
- knowbe4-site-verification=51461e606dee060193ee355edc25e9ad
Full email verification for firstclassairsupport.com
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