Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
stbk-duesseldorf.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-23 00:33:43 UTC · ↺ Refresh
MX Hostnames
- line1a.virus-defence.de
- line1b.virus-defence.de
MX Priorities
- line1a.virus-defence.de: 10
- line1b.virus-defence.de: 30
A / AAAA Records
- 193.9.117.130 ↩ ac.rz-nbg.de
Mail Server IPs
- 80.82.218.16 ↩ line1a.virus-defence.de
- 87.190.16.131 ↩ line1b.virus-defence.de
SOA Record
Raw SOA
a.ns14.net domains.auctores.de 2025020601 43200 7200 1209600 86400
Primary NS (mname)
a.ns14.net
Admin Email (rname)
domains@auctores.de
Serial
2025020601
Refresh
43200s
Retry
7200s
Expire
1209600s
Minimum TTL
86400s
Nameservers (NS)
c.ns14.net
b.ns14.net
a.ns14.net
d.ns14.net
SPF Record
✓ Strict (-all)
v=spf1 a mx a:zwv04.zellwerk.net ip4:162.55.79.18 include:spfext.espectrum-hosting.de include:spfserver.auctores.de include:spf.protection.outlook.com -all
📊 DNS lookups: 6/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✗ MissingNo DMARC record — emails cannot be rejected on auth failure.
DKIM Selectors
✓ 2 found
selector1._domainkey
selector2._domainkey
✓ DKIM properly configured for selector: selector1
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
2 records- SPFv=spf1 a mx a:zwv04.zellwerk.net ip4:162.55.79.18 include:spfext.espectrum-hosting.de include:spfserver.auctores.de include:spf.protection.outlook.com -all
- MS=ms78345766
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 stbk-duesseldorf.de
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits