Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
katharineum.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-04-06 14:50:35 UTC · ↺ Refresh
MX Hostnames
- postoffice.katharineum.de
MX Priorities
- postoffice.katharineum.de: 10
A / AAAA Records
- 89.58.31.123 ↩ v220220180504176592.nicesrv.de
- 2a03:4000:63:d9e:c87d:aff:fec8:3432 (no PTR)
Mail Server IPs
- 159.69.249.145 ↩ postoffice.katharineum.de
- 2a01:4f8:c010:1c56::1 ↩ postoffice.katharineum.de
SOA Record
Raw SOA
ns.katharineum.de hostmasters.lists.katharineum.de 2026021901 3600 1800 43200 10800
Primary NS (mname)
ns.katharineum.de
Admin Email (rname)
hostmasters@lists.katharineum.de
Serial
2026021901
Refresh
3600s
Retry
1800s
Expire
43200s
Minimum TTL
10800s
Nameservers (NS)
c.ns14.net
b.ns14.net
d.ns14.net
SPF Record
✓ Soft Fail (~all)
v=spf1 mx ip4:159.69.249.145 ip6:2a01:4f8:c010:1c56::1 ~all
📊 DNS lookups: 1/10
~ Soft fail (~all) — moderate enforcement
DMARC Record
✓ Reject
v=DMARC1; p=reject; sp=reject; adkim=r; aspf=r; ri=86400; pct=100; rua=mailto:[email protected]; ruf=mailto:[email protected]; fo=1
✓ Reject — strongest protection
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
↳ Subdomain policy: reject
DKIM Selectors
✓ 1 found
dkim._domainkey
✓ Public key: 216 chars (valid)
✓ DKIM properly configured for selector: dkim
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
1 record- SPFv=spf1 mx ip4:159.69.249.145 ip6:2a01:4f8:c010:1c56::1 ~all
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