Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
knapheide.de
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-04-02 02:50:42 UTC · ↺ Refresh
MX Hostnames
- hansaflex-com01c.mail.protection.outlook.com
MX Priorities
- hansaflex-com01c.mail.protection.outlook.com: 10
A / AAAA Records
- 148.251.183.253 ↩ donald.stutenbaeumer.com
Mail Server IPs
- 52.101.73.11 ↩ mail-am1pr04cu00103.inbound.protection.outlook.com
- 52.101.68.3 ↩ mail-db7pr03cu00403.inbound.protection.outlook.com
- 52.101.73.2 ↩ mail-as9pr07cu00302.inbound.protection.outlook.com
- 52.101.73.153 ↩ mail-as8pr05cu00401.inbound.protection.outlook.com
SOA Record
Raw SOA
ns.udag.de hostmaster.united-domains.de 2024091825 10800 3600 604800 3600
Primary NS (mname)
ns.udag.de
Admin Email (rname)
hostmaster@united-domains.de
Serial
2024091825
Refresh
10800s
Retry
3600s
Expire
604800s
Minimum TTL
3600s
Nameservers (NS)
ns.udag.org
ns.udag.net
ns.udag.de
SPF Record
✓ Strict (-all)
v=spf1 a mx include:spf.protection.outlook.com ip4:78.94.48.41 ip4:87.190.41.188 ip4:62.225.139.105 ip4:62.225.139.112 -all
📊 DNS lookups: 3/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✗ p=none
v=DMARC1; p=none; rua=mailto:[email protected];
⚠ p=none — monitoring only, no enforcement
📋 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
5 records- SPFv=spf1 a mx include:spf.protection.outlook.com ip4:78.94.48.41 ip4:87.190.41.188 ip4:62.225.139.105 ip4:62.225.139.112 -all
- MS=ms70513784
- MS=31067F1E9DB9B5402A0ADFAE6C4962655D2C2D60
- _globalsign-domain-verification=FK5dOZ8JOOQhrB2sQOCXXH2b5XarGEzhCAvkyFEceM
- google-site-verification=g-_Lr-ma81u1Jqh2OhHwxhc4O4C69xYdKUGpFTNm25E
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 knapheide.de
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits