Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
criticalhub.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-30 10:27:31 UTC · ↺ Refresh
MX Hostnames
- criticalhub-com.mail.protection.outlook.com
MX Priorities
- criticalhub-com.mail.protection.outlook.com: 0
A / AAAA Records
- 16.15.191.143 (no PTR)
- 52.217.194.141 ↩ s3-website-us-east-1.amazonaws.com
- 16.182.99.61
- 16.15.199.111
- 16.15.223.5
- 16.15.199.40
- 16.15.199.46
- 52.217.36.227
Mail Server IPs
- 52.101.50.4 ↩ mail-co1pr03cu00404.inbound.protection.outlook.com
- 52.101.50.13 ↩ mail-mw2pr02cu00605.inbound.protection.outlook.com
- 52.101.9.5 ↩ mail-mn2pr04cu00205.inbound.protection.outlook.com
- 52.101.40.1 ↩ mail-cy4pr03cu00101.inbound.protection.outlook.com
- 2a01:111:f403:f901::1 ↩ mail-bl0pr02cu00601.inbound.protection.outlook.com
- 2a01:111:f403:f804::2 ↩ mail-co1pr05cu00402.inbound.protection.outlook.com
- 2a01:111:f403:c902::2 ↩ mail-sj0pr03cu01602.inbound.protection.outlook.com
- 2a01:111:f403:f90c:: ↩ mail-sn1pr03cu00100.inbound.protection.outlook.com
SOA Record
Raw SOA
ns-1851.awsdns-39.co.uk awsdns-hostmaster.amazon.com 1 7200 900 1209600 86400
Primary NS (mname)
ns-1851.awsdns-39.co.uk
Admin Email (rname)
awsdns-hostmaster@amazon.com
Serial
1
Refresh
7200s
Retry
900s
Expire
1209600s
Minimum TTL
86400s
Nameservers (NS)
ns-825.awsdns-39.net
ns-1287.awsdns-32.org
ns-1851.awsdns-39.co.uk
ns-292.awsdns-36.com
SPF Record
✓ Strict (-all)
v=spf1 ip4:209.91.192.146/32 ip4:209.91.199.22/32 ip4:209.91.216.32/27 ip4:209.91.245.0/24 a:portabox-sl.vozpr.com include:spf.protection.outlook.com include:spf.mandrillapp.com -all
📊 DNS lookups: 3/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
~ Quarantine
v=DMARC1; p=quarantine; 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: 216 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
3 records- SPFv=spf1 ip4:209.91.192.146/32 ip4:209.91.199.22/32 ip4:209.91.216.32/27 ip4:209.91.245.0/24 a:portabox-sl.vozpr.com include:spf.protection.outlook.com include:spf.mandrillapp.com -all
- MS=ms87307393
- google-site-verification=y0CSBzzdaN_gWBYwM4vJS2N-HkI5_0kKgND-VhYv-EA
Full email verification for criticalhub.com
Run SMTP check, SPF/DKIM/DMARC and catch-all detection.
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