Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
btb-verlag.de
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-25 02:27:44 UTC · ↺ Refresh
MX Hostnames
- btbverlag-de0i.mail.protection.outlook.com
MX Priorities
- btbverlag-de0i.mail.protection.outlook.com: 10
A / AAAA Records
- 146.185.106.200 (no PTR)
Mail Server IPs
- 52.101.68.18 ↩ mail-db4pr02cu00302.inbound.protection.outlook.com
- 52.101.73.4 ↩ mail-am0pr83cu00404.inbound.protection.outlook.com
- 52.101.68.29 ↩ mail-dbapr03cu00105.inbound.protection.outlook.com
- 52.101.68.27 ↩ mail-db7pr03cu00503.inbound.protection.outlook.com
SOA Record
Raw SOA
dns017.arvato-systems.de hostmaster.bnic.bertelsmann.de 2024101700 3600 1800 3600000 3600
Primary NS (mname)
dns017.arvato-systems.de
Admin Email (rname)
hostmaster@bnic.bertelsmann.de
Serial
2024101700
Refresh
3600s
Retry
1800s
Expire
3600000s
Minimum TTL
3600s
Nameservers (NS)
dns017.arvato-systems.de
dns009.arvato-systems.de
ns2.arvato-systems.de
ns1.arvato-systems.de
SPF Record
✓ Strict (-all)
v=spf1 mx include:spf.servicemail24.de include:spf.protection.outlook.com -all
📊 DNS lookups: 3/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✓ Reject
v=DMARC1; p=reject; sp=reject; rua=mailto:[email protected]; pct=100; ri=86400
✓ Reject — strongest protection
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
↳ Subdomain policy: reject
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=ms64704854
- SPFv=spf1 mx include:spf.servicemail24.de include:spf.protection.outlook.com -all
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