teachingmachine.de

Valid Email Server
Domain Lookup › teachingmachine.de

Domain Overview

DNS: ✓ 2mo ago Checker: ✓ 2mo ago
teachingmachine.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No

Checked via [email protected] · 2026-04-02 05:52:20 UTC · ↺ Refresh

MX Hostnames

  • mail.teachingmachine.de
  • mx2f6e.netcup.net

MX Priorities

  • mail.teachingmachine.de: 10
  • mx2f6e.netcup.net: 50

A / AAAA Records

  • 188.68.47.108 ↩ a2f6c.netcup.net
  • 2a03:4000:30:b62a::14:7301 (no PTR)

Mail Server IPs

  • 188.68.47.110 ↩ mx2f6e.netcup.net

SOA Record

Raw SOA root-dns.netcup.net dnsadmin.netcup.net 2021012919 28800 7200 1209600 86400
Primary NS (mname)
root-dns.netcup.net
Admin Email (rname)
dnsadmin@netcup.net
Serial
2021012919
Refresh
28800s
Retry
7200s
Expire
1209600s
Minimum TTL
86400s

Nameservers (NS)

second-dns.netcup.net
third-dns.netcup.net
root-dns.netcup.net

SPF Record

✓ Strict (-all)
v=spf1 mx a include:_spf.webhosting.systems -all
📊 DNS lookups: 3/10
✓ Hard fail (-all) — strict enforcement

DMARC Record

✓ Reject
v=DMARC1;p=reject;sp=reject;adkim=s;aspf=s;pct=100;rua=mailto:[email protected];ruf=mailto:[email protected];
✓ Reject — strongest protection
📋 SPF alignment: Strict · DKIM alignment: Strict
📧 Reports → mailto:[email protected]
↳ Subdomain policy: reject

DKIM Selectors

✗ None detected

No 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=a-LdfD1rl8oAepkIJCRL7HHjNV9-LECA_JqUZjaHzd8
  • SPFv=spf1 mx a include:_spf.webhosting.systems -all
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