Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
sum-bc.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-25 16:44:19 UTC · ↺ Refresh
MX Hostnames
- mail.clustermail.de
MX Priorities
- mail.clustermail.de: 10
A / AAAA Records
- 212.63.130.86 ↩ srv06.17930.serviceprovider.de
- 2a02:708::6b:0:0:0:2 ↩ srv06.17930.serviceprovider.de
Mail Server IPs
- 212.223.165.71 ↩ frontend.clustermail.de
SOA Record
Raw SOA
ns12.nameserver.de dnsmaster.ns12.nameserver.de 2025102401 10000 1800 604800 3600
Primary NS (mname)
ns12.nameserver.de
Admin Email (rname)
dnsmaster@ns12.nameserver.de
Serial
2025102401
Refresh
10000s
Retry
1800s
Expire
604800s
Minimum TTL
3600s
Nameservers (NS)
ns12.nameserver.de
ns11.nameserver.de
SPF Record
✓ Strict (-all)
v=spf1 include:spf.clustermail.de -all
📊 DNS lookups: 1/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✗ MissingNo DMARC record — emails cannot be rejected on auth failure.
DKIM Selectors
✓ 1 found
dkim._domainkey
✓ Public key: 392 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
3 records- MS=ms27241043
- SPFv=spf1 include:spf.clustermail.de -all
- facebook-domain-verification=jgnwuv59bsfjz021wt2e3y8bo48qri
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