blue21.de

Valid Email Server
Domain Lookup › blue21.de

Domain Overview

DNS: ✓ 2mo ago Checker: ✓ 2mo ago
blue21.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No

Checked via [email protected] · 2026-03-29 20:15:55 UTC · ↺ Refresh

MX Hostnames

  • mx1.heinlein-support.de
  • mx3.heinlein-support.de
  • mx-n.heinlein-support.de
  • mx2.heinlein-support.de

MX Priorities

  • mx-n.heinlein-support.de: 50
  • mx1.heinlein-support.de: 10
  • mx2.heinlein-support.de: 10
  • mx3.heinlein-support.de: 20

A / AAAA Records

  • 49.13.131.230 ↩ phoenix.resyst.de

Mail Server IPs

  • 91.198.250.17 ↩ mx-n.mailbox.org
  • 91.198.250.10 ↩ mx1.heinlein-support.de
  • 91.198.250.20 ↩ mx2.heinlein-support.de
  • 91.198.250.30 ↩ mx3.heinlein-support.de

SOA Record

Raw SOA ns.jpberlin.de root.jpberlin.de 2025112414 40000 7200 604800 86400
Primary NS (mname)
ns.jpberlin.de
Admin Email (rname)
root@jpberlin.de
Serial
2025112414
Refresh
40000s
Retry
7200s
Expire
604800s
Minimum TTL
86400s

Nameservers (NS)

ns3.jpberlin.de
ns.jpberlin.de
ns2.jpberlin.de

SPF Record

✓ Soft Fail (~all)
v=spf1 ip4:213.203.238.0/25 ip4:195.10.208.0/24 ip4:91.198.250.0/24 mx include:jpberlin.de ?all
📊 DNS lookups: 2/10
? Neutral (?all) — no enforcement

DMARC Record

✗ p=none
v=DMARC1; p=none
⚠ p=none — monitoring only, no enforcement
📋 SPF alignment: Relaxed · DKIM alignment: Relaxed
⚠ No aggregate reports (rua= not set)

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

1 record
  • SPFv=spf1 ip4:213.203.238.0/25 ip4:195.10.208.0/24 ip4:91.198.250.0/24 mx include:jpberlin.de ?all
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