Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
bleckbox.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-24 23:50:34 UTC · ↺ Refresh
MX Hostnames
- mx-01.mail-forwarder.io
- mx-02.mail-forwarder.io
MX Priorities
- mx-02.mail-forwarder.io: 10
- mx-01.mail-forwarder.io: 10
A / AAAA Records
- 5.22.145.121 ↩ relay.mail-forwarder.io
- 5.22.145.16 ↩ relay.mail-forwarder.io
- 2a00:18e0:5:3:dfe2:c743:85aa:61bc ↩ relay.mail-forwarder.io
- 2a00:18e0:5:2:7577:4e4d:413b:f507 ↩ relay.mail-forwarder.io
Mail Server IPs
- 5.22.145.16 ↩ relay.mail-forwarder.io
- 5.22.145.121 ↩ relay.mail-forwarder.io
- 2a00:18e0:5:3:dfe2:c743:85aa:61bc ↩ relay.mail-forwarder.io
- 2a00:18e0:5:2:7577:4e4d:413b:f507 ↩ relay.mail-forwarder.io
SOA Record
Raw SOA
ns1.domaindiscount24.net tech.key-systems.net 2023011904 10800 3600 604800 28800
Primary NS (mname)
ns1.domaindiscount24.net
Admin Email (rname)
tech@key-systems.net
Serial
2023011904
Refresh
10800s
Retry
3600s
Expire
604800s
Minimum TTL
28800s
Nameservers (NS)
ns3.domaindiscount24.net
ns1.domaindiscount24.net
ns2.domaindiscount24.net
SPF Record
✓ Strict (-all)
v=spf1 +a:home.bleckbox.de +a:dyndns.bleckbox.de -all
📊 DNS lookups: 2/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✗ MissingNo DMARC record — emails cannot be rejected on auth failure.
DKIM Selectors
✓ 13 found
google._domainkey
selector1._domainkey
selector2._domainkey
default._domainkey
mail._domainkey
dkim._domainkey
k1._domainkey
s1._domainkey
s2._domainkey
zoho._domainkey
sendgrid._domainkey
mxvault._domainkey
amazonses._domainkey
⚠ Public key (p=) missing in DKIM record for selector google.
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
2 records- google-site-verification=JTzRdTW5kbj5LurYtU4nx588ym9jqtWVEbdvpbjKifY
- SPFv=spf1 +a:home.bleckbox.de +a:dyndns.bleckbox.de -all
Full email verification for bleckbox.de
Run SMTP check, SPF/DKIM/DMARC and catch-all detection.
SPF / DKIM / DMARC Get 1,000 Free Credits