Domain Overview
DNS: ✓ 4d ago
Checker: ✓ 4d ago
polygon-deutschland.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-05-18 03:17:28 UTC · ↺ Refresh
MX Hostnames
- mail.polygonvatro.de
MX Priorities
- mail.polygonvatro.de: 10
A / AAAA Records
- 45.144.187.21 (no PTR)
Mail Server IPs
- 217.89.40.41 ↩ mail.polygonvatro.de
SOA Record
Raw SOA
ns.siegnetz.de hostmaster.siegnetz.de 2026041801 14400 1800 1209600 1800
Primary NS (mname)
ns.siegnetz.de
Admin Email (rname)
hostmaster@siegnetz.de
Serial
2026041801
Refresh
14400s
Retry
1800s
Expire
1209600s
Minimum TTL
1800s
Nameservers (NS)
ns.siegnetz.de
dns2.epag.net
dns1.epag.net
rz2.siegnetz.de
SPF Record
✓ Strict (-all)
v=spf1 +ip4:217.89.40.32/27 +ip4:185.21.145.183 +ip4:89.146.215.142 +mx include:spf.crsend.com include:_spf.polygon-deutschland.de include:spf.mspmanager.com -all
📊 DNS lookups: 4/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
~ Quarantine
v=DMARC1; p=quarantine; rua=mailto:[email protected]; ruf=mailto:[email protected]; sp=quarantine; fo=0; pct=100; adkim=r; aspf=s
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Strict
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
↳ Subdomain policy: quarantine
DKIM Selectors
✓ 1 found
mail._domainkey
✓ Public key: 392 chars (valid)
✓ DKIM properly configured for selector: mail
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
5 records- SPFv=spf1 +ip4:217.89.40.32/27 +ip4:185.21.145.183 +ip4:89.146.215.142 +mx include:spf.crsend.com include:_spf.polygon-deutschland.de include:spf.mspmanager.com -all
- apple-domain-verification=wHHYYKfLs5RcO1y4
- swisssign-check=t5fIKeaQtS1onj70M-fA-Fax8S4
- domainVerification=ad58c3cc-8540-42b9-8bee-10637b1209b7
- MS=ms93394830
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 polygon-deutschland.de
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits