Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
dubor.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Did you mean: [email protected]
Checked via [email protected]
· 2026-03-24 23:54:38 UTC · ↺ Refresh
MX Hostnames
- mx03.hornetsecurity.com
- mx02.hornetsecurity.com
- mx04.hornetsecurity.com
- mx01.hornetsecurity.com
MX Priorities
- mx01.hornetsecurity.com: 10
- mx02.hornetsecurity.com: 20
- mx04.hornetsecurity.com: 40
- mx03.hornetsecurity.com: 30
A / AAAA Records
- 212.8.207.35 ↩ web2.teuto.net
- 2001:ae2:207::1:eb:2 ↩ web2.teuto.net
Mail Server IPs
- 94.100.132.8 ↩ mx01.hornetsecurity.com
- 94.100.136.8 ↩ mx02.hornetsecurity.com
- 94.100.136.7 ↩ mx04.hornetsecurity.com
- 94.100.134.8 ↩ mx03.hornetsecurity.com
SOA Record
Raw SOA
ns1.teuto.net hostmaster.teuto.net 2026032302 28000 7200 604800 86400
Primary NS (mname)
ns1.teuto.net
Admin Email (rname)
hostmaster@teuto.net
Serial
2026032302
Refresh
28000s
Retry
7200s
Expire
604800s
Minimum TTL
86400s
Nameservers (NS)
ns3.teuto.net
ns1.teuto.net
ns2.teuto.net
SPF Record
✓ Strict (-all)
v=spf1 ip4:194.34.201.14 ip4:87.128.9.250 a:fax.dubor.de include:spf.protection.outlook.com include:spf.hornetsecurity.com include:spf.teuto.net -all
📊 DNS lookups: 4/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✓ Reject
v=DMARC1; p=reject; rua=mailto:[email protected]; ruf=mailto:[email protected]; fo=1
✓ Reject — strongest protection
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
DKIM Selectors
✓ 2 found
selector1._domainkey
selector2._domainkey
✓ Public key: 392 chars (valid)
✓ 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 ip4:194.34.201.14 ip4:87.128.9.250 a:fax.dubor.de include:spf.protection.outlook.com include:spf.hornetsecurity.com include:spf.teuto.net -all
- MS=ms53452254
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 dubor.de
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits