Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
rengsdorf.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-31 14:48:13 UTC · ↺ Refresh
MX Hostnames
- mailmx0004.rlp.de
- mailmx0002.rlp.de
- mailmx0003.rlp.de
- mailmx0001.rlp.de
MX Priorities
- mailmx0004.rlp.de: 10
- mailmx0001.rlp.de: 10
- mailmx0002.rlp.de: 10
- mailmx0003.rlp.de: 10
A / AAAA Records
- 89.110.176.82 (no PTR)
Mail Server IPs
- 83.243.48.74 ↩ mailmx0004.rlp.de
- 83.243.48.71 ↩ mailmx0001.rlp.de
- 83.243.48.72 ↩ mailmx0002.rlp.de
- 83.243.48.101 ↩ mailmx0003.rlp.de
SOA Record
Raw SOA
ns-a.ktk.de hostmaster.noc.ktk.de 2019052118 3600 900 604800 3600
Primary NS (mname)
ns-a.ktk.de
Admin Email (rname)
hostmaster@noc.ktk.de
Serial
2019052118
Refresh
3600s
Retry
900s
Expire
604800s
Minimum TTL
3600s
Nameservers (NS)
ns-a.ktk.de
ns-b.ktk.io
ns-c.ktk.de
SPF Record
✓ Soft Fail (~all)
v=spf1 mx ip4:83.243.48.64/26 include:mail.ktk.de ~all
📊 DNS lookups: 2/10
~ Soft fail (~all) — moderate enforcement
DMARC Record
✓ Reject
v=DMARC1;p=reject;pct=100;adkim=r;aspf=r;fo=1;rua=mailto:[email protected];
✓ Reject — strongest protection
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
DKIM Selectors
✗ None detectedNo DKIM records found for common selectors — your provider may use a custom selector name.
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
1 record- SPFv=spf1 mx ip4:83.243.48.64/26 include:mail.ktk.de ~all
Free · No signup required
Add email validation to your forms
Block disposable emails, validate MX records, detect role accounts — unlimited, forever free.
<script src="https://check.verifyswift.com/"></script>
One line of code · Works on any site
See demo & docs
Deep verification
Full email verification for rengsdorf.de
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits