zsk.de

Valid Email Server
Domain Lookup › zsk.de

Domain Overview

DNS: ✓ 2mo ago Checker: ✓ 2mo ago
zsk.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Did you mean: [email protected]

Checked via [email protected] · 2026-03-18 22:36:26 UTC · ↺ Refresh

MX Hostnames

  • mx03.hornetsecurity.com
  • mx02.hornetsecurity.com
  • mx04.hornetsecurity.com
  • mx01.hornetsecurity.com

MX Priorities

  • mx04.hornetsecurity.com: 40
  • mx01.hornetsecurity.com: 10
  • mx02.hornetsecurity.com: 20
  • mx03.hornetsecurity.com: 30

A / AAAA Records

  • 159.255.168.139 (no PTR)

Mail Server IPs

  • 94.100.136.7 ↩ mx04.hornetsecurity.com
  • 94.100.132.8 ↩ mx01.hornetsecurity.com
  • 94.100.136.8 ↩ mx02.hornetsecurity.com
  • 94.100.134.8 ↩ mx03.hornetsecurity.com

SOA Record

Raw SOA dns.btnet.de sysadmin.btnet.de 2026012701 86400 7200 604800 3600
Primary NS (mname)
dns.btnet.de
Admin Email (rname)
sysadmin@btnet.de
Serial
2026012701
Refresh
86400s
Retry
7200s
Expire
604800s
Minimum TTL
3600s

Nameservers (NS)

dns.btnet.de
dns3.btnet.de
dns2.btnet.de

SPF Record

✓ Strict (-all)
v=spf1 mx include:_spf.rittec.de include:spfhard.crsend.com ip4:159.255.168.139 ip4:159.255.168.143 ip4:159.255.168.129 include:spf.protection.outlook.com include:_spf.salesforce.com include:spf.hornetsecurity.com -all
📊 DNS lookups: 6/10
✓ Hard fail (-all) — strict enforcement

DMARC Record

✗ p=none
v=DMARC1; p=none; rua=mailto:[email protected]; ruf=mailto:[email protected];
⚠ p=none — monitoring only, no enforcement
📋 SPF alignment: Relaxed · DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]

DKIM Selectors

✓ 1 found
mail._domainkey
✓ Public key: 392 chars (valid)
✓ DKIM properly configured for selector: mail

Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses

All TXT Records

3 records
  • MS=ms31188333
  • SPFv=spf1 mx include:_spf.rittec.de include:spfhard.crsend.com ip4:159.255.168.139 ip4:159.255.168.143 ip4:159.255.168.129 include:spf.protection.outlook.com include:_spf.salesforce.com include:spf.hornetsecurity.com -all
  • ppe-9c5ce93920071943266bb8e99336fbd23976c597
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