Domain Overview
DNS: ✓ 3d ago
Checker: ✓ 3d ago
mckb.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Did you mean: [email protected]
Checked via [email protected]
· 2026-05-18 02:47:25 UTC · ↺ Refresh
MX Hostnames
- mckb-com.mail.protection.outlook.com
MX Priorities
- mckb-com.mail.protection.outlook.com: 10
A / AAAA Records
- 162.241.156.76 ↩ boo3.boosthoster.com
Mail Server IPs
- 52.101.50.7 ↩ mail-co1pr21cu00207.inbound.protection.outlook.com
- 52.101.41.56 ↩ mail-sj0pr21cu00100.inbound.protection.outlook.com
- 52.101.41.58 ↩ mail-sj0pr02cu00102.inbound.protection.outlook.com
- 52.101.11.3 ↩ mail-sn1pr0501cu00103.inbound.protection.outlook.com
- 2a01:111:f403:c902:: ↩ mail-sj2pr05cu00300.inbound.protection.outlook.com
- 2a01:111:f403:c903::3 ↩ mail-mw2pr02cu00503.inbound.protection.outlook.com
- 2a01:111:f403:c902::7 ↩ mail-sj0pr02cu00107.inbound.protection.outlook.com
- 2a01:111:f403:c902::6 ↩ mail-sj0pr21cu00106.inbound.protection.outlook.com
SOA Record
Raw SOA
ns20.digicertdns.com dns.digicertdns.com 2009010117 43200 3600 1209600 180
Primary NS (mname)
ns20.digicertdns.com
Admin Email (rname)
dns@digicertdns.com
Serial
2009010117
Refresh
43200s
Retry
3600s
Expire
1209600s
Minimum TTL
180s
Nameservers (NS)
ns21.digicertdns.com
ns22.digicertdns.com
ns24.digicertdns.net
ns25.digicertdns.net
ns20.digicertdns.com
ns23.digicertdns.net
SPF Record
✓ Strict (-all)
v=spf1 ip4:100.2.174.122/25 include:sendgrid.net ip4:75.99.93.170 ip4:148.170.225.130 include:smtp.cnsitinc.com include:spf.protection.outlook.com -all
📊 DNS lookups: 3/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
~ Quarantine
v=DMARC1; p=quarantine; rua=mailto:[email protected]
~ 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
2 records- MS=ms90882958
- SPFv=spf1 ip4:100.2.174.122/25 include:sendgrid.net ip4:75.99.93.170 ip4:148.170.225.130 include:smtp.cnsitinc.com include:spf.protection.outlook.com -all
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