Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
doorn.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Did you mean: [email protected]
Checked via [email protected]
· 2026-04-01 13:49:24 UTC · ↺ Refresh
MX Hostnames
- mail.r2u-systems.de
MX Priorities
- mail.r2u-systems.de: 10
A / AAAA Records
- 212.185.50.42 (no PTR)
Mail Server IPs
- 109.230.233.170 ↩ mail.r2u-systems.de
SOA Record
Raw SOA
c.ns.bueroring.de info.doorn.de 2025021401 10800 3600 604800 10800
Primary NS (mname)
c.ns.bueroring.de
Admin Email (rname)
info@doorn.de
Serial
2025021401
Refresh
10800s
Retry
3600s
Expire
604800s
Minimum TTL
10800s
Nameservers (NS)
c.ns.bueroring.de
b.ns.bueroring.de
SPF Record
✓ Strict (-all)
v=spf1 ip4:109.230.233.170/32 ip4:109.230.233.171/32 ip4:83.220.131.176/28 ip4:217.89.97.116 -all
📊 DNS lookups: 0/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
~ Quarantine
v=DMARC1;p=quarantine;sp=none;pct=100;rua=mailto:[email protected];ruf=mailto:[email protected];ri=86400;aspf=r;adkim=r;fo=1;
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
↳ Subdomain policy: none
DKIM Selectors
✓ 2 found
default._domainkey
k1._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- google-site-verification=auoY4-tHRVUqEr1sIyxOcC0tIMAaXDhwngvmwpJC6SQ
- SPFv=spf1 ip4:109.230.233.170/32 ip4:109.230.233.171/32 ip4:83.220.131.176/28 ip4:217.89.97.116 -all
Full email verification for doorn.de
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