Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
krassow-bau.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-26 10:12:11 UTC · ↺ Refresh
MX Hostnames
- mail.krassow-bau.de
MX Priorities
- mail.krassow-bau.de: 10
A / AAAA Records
- 81.169.145.86 ↩ w86.rzone.de
- 2a01:238:20a:202:1086:: ↩ w86.rzone.de
Mail Server IPs
- 62.91.84.230 ↩ mail.krassow-bau.de
SOA Record
Raw SOA
shades06.rzone.de hostmaster.strato-rz.de 2020051426 86400 7200 604800 300
Primary NS (mname)
shades06.rzone.de
Admin Email (rname)
hostmaster@strato-rz.de
Serial
2020051426
Refresh
86400s
Retry
7200s
Expire
604800s
Minimum TTL
300s
Nameservers (NS)
docks01.rzone.de
shades06.rzone.de
SPF Record
✓ Strict (-all)
v=spf1 a mx ip4:87.140.114.27 ip4:62.91.84.230 a:mail.krassow-bau.de a:owa.krassow-bau.de -all
📊 DNS lookups: 4/10
✓ 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
1 record- SPFv=spf1 a mx ip4:87.140.114.27 ip4:62.91.84.230 a:mail.krassow-bau.de a:owa.krassow-bau.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 krassow-bau.de
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits