Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
mainhaus-frankfurt.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-19 13:58:20 UTC · ↺ Refresh
MX Hostnames
- mailout.kolping.de
- mail3.kolping.de
MX Priorities
- mailout.kolping.de: 10
- mail3.kolping.de: 50
A / AAAA Records
- 65.108.96.42 ↩ linux04.hotelnetsolutions.com
Mail Server IPs
- 84.245.141.137 ↩ mailout.kolping.de
- 62.112.72.54 ↩ mail3.kolping.de
SOA Record
Raw SOA
a.ns14.net adminteam.gruen.net 2025020600 43200 7200 1209600 86400
Primary NS (mname)
a.ns14.net
Admin Email (rname)
adminteam@gruen.net
Serial
2025020600
Refresh
43200s
Retry
7200s
Expire
1209600s
Minimum TTL
86400s
Nameservers (NS)
d.ns14.net
b.ns14.net
a.ns14.net
c.ns14.net
SPF Record
✓ Strict (-all)
v=spf1 +a +mx +a:www194.gruen.net +a:mailout.kolping.de include:spf.protection.outlook.com include:oracleindustry.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
✓ 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- MS=ms83519459
- SPFv=spf1 +a +mx +a:www194.gruen.net +a:mailout.kolping.de include:spf.protection.outlook.com include:oracleindustry.com -all
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 mainhaus-frankfurt.de
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits