Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
tzu.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Did you mean: [email protected]
Checked via [email protected]
· 2026-03-25 18:23:56 UTC · ↺ Refresh
MX Hostnames
- mx04.hornetsecurity.com
- mx02.hornetsecurity.com
- mx03.hornetsecurity.com
- mx01.hornetsecurity.com
MX Priorities
- mx01.hornetsecurity.com: 10
- mx03.hornetsecurity.com: 30
- mx02.hornetsecurity.com: 20
- mx04.hornetsecurity.com: 40
A / AAAA Records
- 217.160.0.177 ↩ 217-160-0-177.elastic-ssl.ui-r.com
- 2001:8d8:100f:f000::2d4 ↩ 2001-08d8-100f-f000-0000-0000-0000-02d4.elastic-ssl.ui-r.com
Mail Server IPs
- 94.100.132.8 ↩ mx01.hornetsecurity.com
- 94.100.134.8 ↩ mx03.hornetsecurity.com
- 94.100.136.8 ↩ mx02.hornetsecurity.com
- 94.100.136.7 ↩ mx04.hornetsecurity.com
SOA Record
Raw SOA
ns1102.ui-dns.com hostmaster.kundenserver.de 2016110536 28800 7200 604800 300
Primary NS (mname)
ns1102.ui-dns.com
Admin Email (rname)
hostmaster@kundenserver.de
Serial
2016110536
Refresh
28800s
Retry
7200s
Expire
604800s
Minimum TTL
300s
Nameservers (NS)
ns1102.ui-dns.com
ns1102.ui-dns.org
ns1102.ui-dns.de
ns1102.ui-dns.biz
SPF Record
✓ Soft Fail (~all)
v=spf1 include:spf-de.emailsignatures365.com include:spf.protection.outlook.com include:spf.hornetsecurity.com a mx ~all
📊 DNS lookups: 5/10
~ Soft fail (~all) — moderate 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
✓ 1 found
default._domainkey
✓ Public key: 392 chars (valid)
✓ DKIM properly configured for selector: default
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
2 records- v=verifydomain MS=1319909
- SPFv=spf1 include:spf-de.emailsignatures365.com include:spf.protection.outlook.com include:spf.hornetsecurity.com a mx ~all
Full email verification for tzu.de
Run SMTP check, SPF/DKIM/DMARC and catch-all detection.
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