Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
krollmann-gruppe.de
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-23 22:13:22 UTC · ↺ Refresh
MX Hostnames
- krollmanngruppe-de02c.mail.protection.outlook.com
MX Priorities
- krollmanngruppe-de02c.mail.protection.outlook.com: 0
A / AAAA Records
- 217.160.0.37 ↩ 217-160-0-37.elastic-ssl.ui-r.com
- 2001:8d8:100f:f000::200 ↩ 2001-08d8-100f-f000-0000-0000-0000-0200.elastic-ssl.ui-r.com
Mail Server IPs
- 52.101.170.2 ↩ mail-fr6p281cu00202.inbound.protection.outlook.com
- 52.101.170.1 ↩ mail-fr4p281cu03101.inbound.protection.outlook.com
- 52.101.170.0 ↩ mail-fr5p281cu00500.inbound.protection.outlook.com
- 52.101.168.0 ↩ mail-beup281cu00100.inbound.protection.outlook.com
- 2a01:111:f403:ca27:: ↩ mail-beup281cu00100.inbound.protection.outlook.com
- 2a01:111:f403:ca2d::1 ↩ mail-fr4p281cu03101.inbound.protection.outlook.com
- 2a01:111:f403:ca2d:: ↩ mail-fr5p281cu00500.inbound.protection.outlook.com
- 2a01:111:f403:ca2d::2 ↩ mail-fr6p281cu00202.inbound.protection.outlook.com
SOA Record
Raw SOA
ns1084.ui-dns.biz hostmaster.1and1.com 2017072462 28800 7200 604800 300
Primary NS (mname)
ns1084.ui-dns.biz
Admin Email (rname)
hostmaster@1and1.com
Serial
2017072462
Refresh
28800s
Retry
7200s
Expire
604800s
Minimum TTL
300s
Nameservers (NS)
ns1123.ui-dns.com
ns1103.ui-dns.org
ns1084.ui-dns.biz
ns1045.ui-dns.de
SPF Record
✓ Strict (-all)
v=spf1 a mx a:mx01.krollmann-gruppe.de include:spf.protection.outlook.com -all
📊 DNS lookups: 4/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✓ Reject
v=DMARC1; p=reject; rua=mailto:[email protected]; ruf=mailto:[email protected]; fo=1; pct=10; adkim=s; aspf=s
✓ Reject — strongest protection
📋 SPF alignment: Strict
· DKIM alignment: Strict
📧 Reports → mailto:[email protected]
⚠ Policy applies to 10% of failing messages only
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=ms27634067
- SPFv=spf1 a mx a:mx01.krollmann-gruppe.de include:spf.protection.outlook.com -all
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