Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
c-t.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Did you mean: [email protected]
Checked via [email protected]
· 2026-03-29 14:53:07 UTC · ↺ Refresh
MX Hostnames
- mail.c-t.de
MX Priorities
- mail.c-t.de: 10
A / AAAA Records
- 91.26.83.188 ↩ mail.c-t.de
Mail Server IPs
- 91.26.83.188 ↩ mail.c-t.de
SOA Record
Raw SOA
ns2.knipp.de dnsmaster.irondns.net 2024032159 10800 3000 2419200 900
Primary NS (mname)
ns2.knipp.de
Admin Email (rname)
dnsmaster@irondns.net
Serial
2024032159
Refresh
10800s
Retry
3000s
Expire
2419200s
Minimum TTL
900s
Nameservers (NS)
ns2.knipp.de
ns17.knipp.net
ns3.knipp.de
SPF Record
✓ Soft Fail (~all)
v=spf1 mx a include:_spf.c-t.de ~all
📊 DNS lookups: 3/10
~ Soft fail (~all) — moderate enforcement
DMARC Record
~ Quarantine
v=DMARC1; p=quarantine; rua=mailto:[email protected]; ruf=mailto:[email protected];
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
DKIM Selectors
✓ 1 found
mail._domainkey
✓ Public key: 392 chars (valid)
✓ DKIM properly configured for selector: mail
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
3 records- amazon-business-verification=8931dcffbb51d6fb1376fcbcfe92b1f8ac014091ee21eaa79775f354c0a69cb5
- MS=ms98994002
- SPFv=spf1 mx a include:_spf.c-t.de ~all
Full email verification for c-t.de
Run SMTP check, SPF/DKIM/DMARC and catch-all detection.
SPF / DKIM / DMARC Get 1,000 Free Credits