Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
columbus.com.br
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-20 17:08:57 UTC · ↺ Refresh
MX Hostnames
- columbus-com-br.mail.protection.outlook.com
MX Priorities
- columbus-com-br.mail.protection.outlook.com: 0
A / AAAA Records
- 172.67.128.109 (no PTR)
- 104.21.1.251 (no PTR)
- 2606:4700:3030::ac43:806d
- 2606:4700:3036::6815:1fb
Mail Server IPs
- 52.101.198.1 ↩ mail-cp4p284cu00401.inbound.protection.outlook.com
- 52.101.200.0 ↩ mail-roap284cu02600.inbound.protection.outlook.com
- 52.101.198.0 ↩ mail-cp5p284cu01800.inbound.protection.outlook.com
- 52.101.198.38 ↩ mail-cp3p284cu00706.inbound.protection.outlook.com
- 2a01:111:f403:c94c:: ↩ mail-roap284cu02600.inbound.protection.outlook.com
- 2a01:111:f403:c94a:: ↩ mail-cp5p284cu01800.inbound.protection.outlook.com
- 2a01:111:f403:c94a::2 ↩ mail-cp3p284cu00702.inbound.protection.outlook.com
- 2a01:111:f403:c94a::1 ↩ mail-cp4p284cu00401.inbound.protection.outlook.com
SOA Record
Raw SOA
daniella.ns.cloudflare.com dns.cloudflare.com 2399454807 10000 2400 604800 1800
Primary NS (mname)
daniella.ns.cloudflare.com
Admin Email (rname)
dns@cloudflare.com
Serial
2399454807
Refresh
10000s
Retry
2400s
Expire
604800s
Minimum TTL
1800s
Nameservers (NS)
daniella.ns.cloudflare.com
zod.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
~ Quarantine
v=DMARC1; p=quarantine; pct=100
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
⚠ No aggregate reports (rua= not set)
DKIM Selectors
✓ 3 found
selector1._domainkey
selector2._domainkey
mail._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
4 records- MS=360FBDAA9E1E1ABE77F9CD4047FA9EF403C51AA6
- google-site-verification=SmTwe0V5_Ug7cP3Z5hD6x1scVkLVuUNYhL2tOrZTYiI
- SPFv=spf1 include:spf.protection.outlook.com -all
- v=verifydomain MS=7645861
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