Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
holborn.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-19 00:09:19 UTC · ↺ Refresh
MX Hostnames
- mx01.hornetsecurity.com
- mx03.hornetsecurity.com
- mx02.hornetsecurity.com
- mx04.hornetsecurity.com
MX Priorities
- mx02.hornetsecurity.com: 20
- mx03.hornetsecurity.com: 30
- mx04.hornetsecurity.com: 40
- mx01.hornetsecurity.com: 10
A / AAAA Records
- 185.159.120.103 ↩ s1.abhosting.de
- 2a0b:fb00:9::185:159:120:103 (no PTR)
Mail Server IPs
- 94.100.136.8 ↩ mx02.hornetsecurity.com
- 94.100.134.8 ↩ mx03.hornetsecurity.com
- 94.100.136.7 ↩ mx04.hornetsecurity.com
- 94.100.132.8 ↩ mx01.hornetsecurity.com
SOA Record
Raw SOA
ns1.ns-serve.net root.ns1.ns-serve.net 1772122486 10800 3600 604800 3600
Primary NS (mname)
ns1.ns-serve.net
Admin Email (rname)
root@ns1.ns-serve.net
Serial
1772122486
Refresh
10800s
Retry
3600s
Expire
604800s
Minimum TTL
3600s
Nameservers (NS)
ns2.ns-serve.net
ns1.ns-serve.net
SPF Record
✓ Strict (-all)
v=spf1 a:mail.holborn.de include:spf.hornetsecurity.com -all
📊 DNS lookups: 2/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
~ Quarantine
v=DMARC1; p=quarantine
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
⚠ No aggregate reports (rua= not set)
DKIM Selectors
✗ None detectedNo DKIM records found for common selectors — your provider may use a custom selector name.
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
7 records- SPFv=spf1 a:mail.holborn.de include:spf.hornetsecurity.com -all
- cisco-ci-domain-verification=589fd508f2c337857def9c73d98faed20b75a06dfce6fc38e5235dc6657c0dce
- 6phrxs84r5l45sc4h1lxxjm9pzt8kpq0
- MS=ms21235100
- h73mz99xjywgdxfp70rhfr6khp4fj0t1
- apple-domain-verification=Ede9DKq3CTwNNCmv
- sykkc4sdlgxv8lvrqvcs60qqlhd4p7ph
Full email verification for holborn.de
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