Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
c3d2.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Did you mean: [email protected]
Checked via [email protected]
· 2026-04-02 08:01:02 UTC · ↺ Refresh
MX Hostnames
- mail.flpk.zentralwerk.org
MX Priorities
- mail.flpk.zentralwerk.org: 10
A / AAAA Records
- 45.158.40.167 ↩ c3d2-web.flpk.zentralwerk.org
- 2a0f:5382:acab:1400::a7 (no PTR)
Mail Server IPs
- 45.158.40.168 ↩ mail.flpk.zentralwerk.org
SOA Record
Raw SOA
ns.c3d2.de hostmaster.c3d2.de 2026032901 14400 1800 604800 600
Primary NS (mname)
ns.c3d2.de
Admin Email (rname)
hostmaster@c3d2.de
Serial
2026032901
Refresh
14400s
Retry
1800s
Expire
604800s
Minimum TTL
600s
Nameservers (NS)
ns1.supersandro.de
ns2.zentralwerk.org
ns.c3d2.de
ns.spaceboyz.net
SPF Record
✓ Strict (-all)
v=spf1 mx -all
📊 DNS lookups: 1/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
~ Quarantine
v=DMARC1; p=quarantine; sp=quarantine; adkim=s; aspf=s; rua=mailto:[email protected]; ruf=mailto:[email protected]; fo=1
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Strict
· DKIM alignment: Strict
📧 Reports → mailto:[email protected]
↳ Subdomain policy: quarantine
DKIM Selectors
✓ 1 found
default._domainkey
✓ Public key: 392 chars (valid)
✓ DKIM properly configured for selector: default
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
2 records- SPFv=spf1 mx -all
- google-site-verification=xGviXV4_vVwsGK2L47JWy6T7hn3OndKflzepyAYgS-Q
Full email verification for c3d2.de
Run SMTP check, SPF/DKIM/DMARC and catch-all detection.
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