Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
rc-systems.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-04-04 22:55:30 UTC · ↺ Refresh
MX Hostnames
- mx2.cnccc.de
- mail.cnccc.de
MX Priorities
- mail.cnccc.de: 10
- mx2.cnccc.de: 20
A / AAAA Records
- 82.165.160.27 ↩ mail.cnccc.de
Mail Server IPs
- 82.165.160.27 ↩ mail.cnccc.de
- 212.132.104.111 ↩ mx2.cnccc.de
SOA Record
Raw SOA
nsa1.schlundtech.de info.rc-systems.de 2024082001 43200 7200 1209600 600
Primary NS (mname)
nsa1.schlundtech.de
Admin Email (rname)
info@rc-systems.de
Serial
2024082001
Refresh
43200s
Retry
7200s
Expire
1209600s
Minimum TTL
600s
Nameservers (NS)
nsa1.schlundtech.de
nsd1.schlundtech.de
nsb1.schlundtech.de
nsc1.schlundtech.de
SPF Record
✓ Strict (-all)
v=spf1 mx -all
📊 DNS lookups: 1/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✓ Reject
v=DMARC1; p=reject; pct=100; rua=mailto:[email protected]; ruf=mailto:[email protected]; fo=1; adkim=r; rf=afrf; sp=quarantine
✓ Reject — strongest protection
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
↳ Subdomain policy: quarantine
DKIM Selectors
✗ None detectedNo DKIM records found for common selectors — your provider may use a custom selector name.
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
2 records- google-site-verification=H-VbA1vtzRyQ8S2xM4HP7jVI1RlLzP8gGimHxh4UxsU
- SPFv=spf1 mx -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 rc-systems.de
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits