Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
dus.de
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Did you mean: [email protected]
Checked via [email protected]
· 2026-03-20 07:42:50 UTC · ↺ Refresh
MX Hostnames
- dus-de.mail.protection.outlook.com
MX Priorities
- dus-de.mail.protection.outlook.com: 0
A / AAAA Records
- 188.40.28.135 ↩ dedi3405.your-server.de
- 2a01:4f8:d0a:11c6::2 ↩ dedi3405.your-server.de
Mail Server IPs
- 52.101.68.15 ↩ mail-db6pr03cu00107.inbound.protection.outlook.com
- 52.101.68.16 ↩ mail-db4pr02cu00400.inbound.protection.outlook.com
- 52.101.68.36 ↩ mail-db5pr02cu00104.inbound.protection.outlook.com
- 52.101.73.24 ↩ mail-as8pr05cu00300.inbound.protection.outlook.com
- 2a01:111:f403:ca09::1 ↩ mail-as9pr07cu00301.inbound.protection.outlook.com
- 2a01:111:f403:ca09::3 ↩ mail-am6pr04cu00303.inbound.protection.outlook.com
- 2a01:111:f403:ca04::c ↩ mail-db9pr02cu00204.inbound.protection.outlook.com
- 2a01:111:f403:ca09::20 ↩ mail-as8pr05cu00400.inbound.protection.outlook.com
SOA Record
Raw SOA
ns1.mainns.de it\.netzwerk.dus.de 1773742741 10800 3600 604800 120
Primary NS (mname)
ns1.mainns.de
Admin Email (rname)
it\@netzwerk.dus.de
Serial
1773742741
Refresh
10800s
Retry
3600s
Expire
604800s
Minimum TTL
120s
Nameservers (NS)
ns3.mainns.net
ns1.mainns.de
ns2.mainns.eu
SPF Record
✓ Strict (-all)
v=spf1 ip4:62.154.187.241 ip4:188.40.28.135 ip4:167.235.176.208 include:spf.protection.outlook.com include:spfhard.crsend.com include:indivsurvey.de -all include:amazonses.com -all
📊 DNS lookups: 4/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
~ Quarantine
v=DMARC1;p=quarantine;sp=quarantine;rua=mailto:[email protected];ruf=mailto:[email protected];aspf=r;adkim=r;fo=1
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
↳ Subdomain policy: quarantine
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- /Xx6lDvNWY2ALRXQWxfOivH2P6bI7eAvXyEW6gG5z7wMRKSkCS1tUyZouw7c3FdtO3w9flnezFjocPwU3ashbg==
- SPFv=spf1 ip4:62.154.187.241 ip4:188.40.28.135 ip4:167.235.176.208 include:spf.protection.outlook.com include:spfhard.crsend.com include:indivsurvey.de -all include:amazonses.com -all
- apple-domain-verification=O9H97DMTfkIaFRls
- asv=d7d5aa7e4f46f7a960f90a8ba57ede78
- 6sng29r6zzfpc9dxc7x34qj01xcpht8w
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 dus.de
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits