ct.de

Valid Email Server
Domain Lookup › ct.de

Domain Overview

DNS: ✓ 1mo ago Checker: ✓ 1mo ago
ct.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Did you mean: [email protected]

Checked via [email protected] · 2026-04-06 16:12:46 UTC · ↺ Refresh

MX Hostnames

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

MX Priorities

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

A / AAAA Records

  • 193.99.144.80 ↩ redirector.heise.de
  • 2a02:2e0:3fe:1001:302:: ↩ redirector.heise.de

Mail Server IPs

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

SOA Record

Raw SOA ns.heise.de hostmaster.heise.de 2025000003 14400 3600 604800 86400
Primary NS (mname)
ns.heise.de
Admin Email (rname)
hostmaster@heise.de
Serial
2025000003
Refresh
14400s
Retry
3600s
Expire
604800s
Minimum TTL
86400s

Nameservers (NS)

robotns2.second-ns.de
ns.heise.de

SPF Record

✓ Soft Fail (~all)
v=spf1 ip4:193.99.144.0/24 ip4:193.99.145.0/24 ip6:2a02:2e0:3fe:1001::/64 ip6:2a00:e68:14:800::/64 include:spf.hornetsecurity.com include:spf.protection.outlook.com ~all
📊 DNS lookups: 2/10
~ Soft fail (~all) — moderate enforcement

DMARC Record

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

DKIM Selectors

✗ None detected

No 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

3 records
  • google-site-verification=z5lnSSDktJj6ZrCF9mdMl2jlUjeGt-DmaNWngFNyOoU
  • miro-verification=601d1e3e9623fe2102de9d6d215a2380ae5c69bd
  • SPFv=spf1 ip4:193.99.144.0/24 ip4:193.99.145.0/24 ip6:2a02:2e0:3fe:1001::/64 ip6:2a00:e68:14:800::/64 include:spf.hornetsecurity.com include:spf.protection.outlook.com ~all
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