Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
holzer.org
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-22 03:10:53 UTC · ↺ Refresh
MX Hostnames
- holzer-org.mail.protection.outlook.com
MX Priorities
- holzer-org.mail.protection.outlook.com: 0
A / AAAA Records
- 89.106.200.142 (no PTR)
Mail Server IPs
- 52.101.42.18 ↩ mail-co1pr03cu00302.inbound.protection.outlook.com
- 52.101.10.18 ↩ mail-bn8pr05cu00302.inbound.protection.outlook.com
- 52.101.41.54 ↩ mail-sj2pr05cu00506.inbound.protection.outlook.com
- 52.101.42.16 ↩ mail-co1pr05cu00300.inbound.protection.outlook.com
- 2a01:111:f403:c902::3 ↩ mail-sj0pr03cu01703.inbound.protection.outlook.com
- 2a01:111:f403:c902::5 ↩ mail-sj2pr05cu00505.inbound.protection.outlook.com
- 2a01:111:f403:c922::2 ↩ mail-bl0pr02cu00702.inbound.protection.outlook.com
- 2a01:111:f403:f802:: ↩ mail-byapr05cu00400.inbound.protection.outlook.com
SOA Record
Raw SOA
ns47.worldnic.com namehost.worldnic.com 125102709 10800 3600 604800 3600
Primary NS (mname)
ns47.worldnic.com
Admin Email (rname)
namehost@worldnic.com
Serial
125102709
Refresh
10800s
Retry
3600s
Expire
604800s
Minimum TTL
3600s
Nameservers (NS)
ns48.worldnic.com
ns47.worldnic.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; 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
9 records- mtvpms61wn7x8ymx0zqs0492wt2hl2lh
- _bzdsf4rpcg75q8byzkfwmgz59iwdw94
- smartsheet-site-validation=m-iWXrHNfu20IwIZOMt0G58Sb7wiDNYq
- z7dx191f3j9dhp281zjsdjq2xkmgrdjs
- apple-domain-verification=Ac0RzsdrMMNm4w3h
- SPFv=spf1 include:spf.protection.outlook.com -all
- cisco-ci-domain-verification=6838cd2ea9831b313c07b7fe5c917ea52b0e9b764e5c6c610ac714b73121b648
- EolXs7zLH8uBXafRX8D/dfOWTnGi1f11KNtPke10Z+Jt8nYAGwfB3dDeuC3RP1pJUxz1oGQb+5Rpy1rJ/nBKQw==
- MS=ms64030410
Full email verification for holzer.org
Run SMTP check, SPF/DKIM/DMARC and catch-all detection.
SPF / DKIM / DMARC Get 1,000 Free Credits