sys4.de

Valid Email Server
Domain Lookup › sys4.de

Domain Overview

DNS: ✓ 2mo ago Checker: ✓ 2mo ago
sys4.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Did you mean: [email protected]

Checked via [email protected] · 2026-04-02 09:15:21 UTC · ↺ Refresh

MX Hostnames

  • mail.sys4.de

MX Priorities

  • mail.sys4.de: 10

A / AAAA Records

  • 194.126.158.152 (no PTR)
  • 2001:1578:400:111::1:3 (no PTR)

Mail Server IPs

  • 194.126.158.132 ↩ mail.sys4.de
  • 2001:1578:400:111::7 ↩ mail.sys4.de

SOA Record

Raw SOA ns.sys4.de hostmaster.sys4.de 2026040204 3600 3600 604800 3600
Primary NS (mname)
ns.sys4.de
Admin Email (rname)
hostmaster@sys4.de
Serial
2026040204
Refresh
3600s
Retry
3600s
Expire
604800s
Minimum TTL
3600s

Nameservers (NS)

ns.sys4.de
ns.schiffbauer.net

SPF Record

✓ Strict (-all)
v=spf1 ip4:212.114.206.217 ip4:194.126.158.132 ip4:194.126.158.144 ip4:188.68.34.52 ip6:2001:1578:400:111::7 ip6:2a03:4000:10:51d:b8ce:63ff:feca:a5a0 -all
📊 DNS lookups: 0/10
✓ Hard fail (-all) — strict enforcement

DMARC Record

~ Quarantine
v=DMARC1; p=quarantine; rua=mailto:[email protected],mailto:[email protected];
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed · DKIM alignment: Relaxed
📧 Reports → mailto:[email protected],mailto:[email protected]

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
  • SPFv=spf1 ip4:212.114.206.217 ip4:194.126.158.132 ip4:194.126.158.144 ip4:188.68.34.52 ip6:2001:1578:400:111::7 ip6:2a03:4000:10:51d:b8ce:63ff:feca:a5a0 -all
  • google-site-verification=wtGOx_S9pRIjpgUgcPshn70zI0yhY8sRZeGwY-OPfyg
  • swisssign-check=m6nAQ26lFOQBCnY4RzqPbdCkHVs
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