Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
stadt-duisburg.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-22 20:42:14 UTC · ↺ Refresh
MX Hostnames
- mx231.duit.de
MX Priorities
- mx231.duit.de: 50
A / AAAA Records
- 147.28.52.171 (no PTR)
Mail Server IPs
- 185.155.188.50 ↩ mx231.duit.de
SOA Record
Raw SOA
ns01.duit.de hostmaster.duit.de 2026021802 10800 3600 604800 10800
Primary NS (mname)
ns01.duit.de
Admin Email (rname)
hostmaster@duit.de
Serial
2026021802
Refresh
10800s
Retry
3600s
Expire
604800s
Minimum TTL
10800s
Nameservers (NS)
ns01.duit.de
ns02.duit.de
SPF Record
✓ Soft Fail (~all)
v=spf1 a mx ip4:52.157.149.216 ~all
📊 DNS lookups: 2/10
~ Soft fail (~all) — moderate 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
✓ 1 found
k1._domainkey
✓ Public key: 216 chars (valid)
✓ DKIM properly configured for selector: k1
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
3 records- apple-domain-verification=zB8aKQXCCIaixQl8
- MS=ms69895581
- SPFv=spf1 a mx ip4:52.157.149.216 ~all
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