Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
spd-alt-marzahn.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-04-01 14:03:55 UTC · ↺ Refresh
MX Hostnames
- mx4.werk21system.de
- mx3.werk21system.de
MX Priorities
- mx3.werk21system.de: 10
- mx4.werk21system.de: 20
A / AAAA Records
- 149.233.9.51 ↩ s112-051.werk21system.de
Mail Server IPs
- 91.216.245.166 ↩ mx3.werk21system.de
- 78.46.128.86 ↩ mx4.werk21system.de
SOA Record
Raw SOA
ns.werk21system.de hostmaster.werk21.de 2025121400 86400 900 2592000 3600
Primary NS (mname)
ns.werk21system.de
Admin Email (rname)
hostmaster@werk21.de
Serial
2025121400
Refresh
86400s
Retry
900s
Expire
2592000s
Minimum TTL
3600s
Nameservers (NS)
ns3.werk21system.de
ns1.werk21system.de
ns2.werk21system.de
SPF Record
✓ Soft Fail (~all)
v=spf1 mx a include:spf1.werk21system.de include:sendersrv.com ~all
📊 DNS lookups: 4/10
~ Soft fail (~all) — moderate 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
1 record- SPFv=spf1 mx a include:spf1.werk21system.de include:sendersrv.com ~all
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