Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
challenger.co
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-25 22:56:17 UTC · ↺ Refresh
MX Hostnames
- challenger-co.mail.protection.outlook.com
MX Priorities
- challenger-co.mail.protection.outlook.com: 0
A / AAAA Records
- 162.215.226.3 ↩ 162-215-226-3.unifiedlayer.com
Mail Server IPs
- 52.101.11.19 ↩ mail-sa9pr04cu00203.inbound.protection.outlook.com
- 52.101.50.13 ↩ mail-mw2pr02cu00605.inbound.protection.outlook.com
- 52.101.8.46 ↩ mail-dm6pr05cu00406.inbound.protection.outlook.com
- 52.101.10.2 ↩ mail-bn8pr03cu00202.inbound.protection.outlook.com
- 2a01:111:f403:c922:: ↩ mail-bl0pr03cu00200.inbound.protection.outlook.com
- 2a01:111:f403:f908:: ↩ mail-bn1pr21cu00100.inbound.protection.outlook.com
- 2a01:111:f403:f902::2 ↩ mail-mn2pr02cu00202.inbound.protection.outlook.com
- 2a01:111:f403:f913:: ↩ mail-cy1pr03cu00100.inbound.protection.outlook.com
SOA Record
Raw SOA
nameserver01.mi.com.co hostmaster.challenger.co 1773878400 10800 3600 1209600 3600
Primary NS (mname)
nameserver01.mi.com.co
Admin Email (rname)
hostmaster@challenger.co
Serial
1773878400
Refresh
10800s
Retry
3600s
Expire
1209600s
Minimum TTL
3600s
Nameservers (NS)
ns1.bdm.microsoftonline.com
SPF Record
✓ Strict (-all)
v=spf1 include:spf.protection.outlook.com include:amazonses.com include:_spf.embluemail.com -all
📊 DNS lookups: 3/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
~ Quarantine
v=DMARC1; p=quarantine; pct=100; rua=mailto:[email protected]; ruf=mailto:[email protected]; fo=1
~ Quarantine — good protection (failing mail goes to spam)
📋 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
6 records- emmfi2f4i7tssqbc98euhhd28b
- lmuuajq05hq6feefqbaovv5uro
- F2X2N6AALBMDS24B8HV99EQTD15DUGSPTK9DU3VD
- sophos-domain-verification=1a9790add139d1d302aa1edb3ea9d178d41a801c6f65827815e3cad6a5c1af95
- SPFv=spf1 include:spf.protection.outlook.com include:amazonses.com include:_spf.embluemail.com -all
- sophos-domain-verification=bae2507c51a788fa4186b8441829b629a1f580594300fd55dca640b5b6a17ff0
Full email verification for challenger.co
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