Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
stb-care.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-27 16:49:01 UTC · ↺ Refresh
MX Hostnames
- server01.mailbutler.net
- server03.mailbutler.net
- server02.mailbutler.net
MX Priorities
- server03.mailbutler.net: 200
- server01.mailbutler.net: 10
- server02.mailbutler.net: 100
A / AAAA Records
- 81.169.145.159 ↩ w9f.rzone.de
- 2a01:238:20a:202:1159:: ↩ w9f.rzone.de
Mail Server IPs
- 136.243.0.177 ↩ server01.mailbutler.net
- 217.92.37.168 ↩ pd95c25a8.dip0.t-ipconnect.de
SOA Record
Raw SOA
shades13.rzone.de hostmaster.strato-rz.de 2020050752 86400 7200 604800 300
Primary NS (mname)
shades13.rzone.de
Admin Email (rname)
hostmaster@strato-rz.de
Serial
2020050752
Refresh
86400s
Retry
7200s
Expire
604800s
Minimum TTL
300s
Nameservers (NS)
shades13.rzone.de
docks16.rzone.de
SPF Record
✓ Strict (-all)
v=spf1 include:cms-carrier.de -all
📊 DNS lookups: 1/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✓ Reject
v=DMARC1;p=reject;
✓ Reject — strongest protection
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
⚠ No aggregate reports (rua= not set)
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
2 records- SPFv=spf1 include:cms-carrier.de -all
- google-site-verification=FwGPjd70bdNZCCnGKwL4QVqDNBbzCjy5CQ-GI_lRd6Q
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 stb-care.de
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits