schaffer-collegen.de

Valid Email Server
Domain Lookup › schaffer-collegen.de

Domain Overview

DNS: ✓ 2mo ago Checker: ✓ 2mo ago
schaffer-collegen.de
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No

Checked via [email protected] · 2026-03-22 06:45:18 UTC · ↺ Refresh

MX Hostnames

  • schaffercollegen-de02b.mail.protection.outlook.com

MX Priorities

  • schaffercollegen-de02b.mail.protection.outlook.com: 10

A / AAAA Records

  • 88.198.28.137 ↩ dedi5938.your-server.de

Mail Server IPs

  • 52.101.68.10 ↩ mail-dbbpr03cu00102.inbound.protection.outlook.com
  • 52.101.68.27 ↩ mail-db7pr03cu00503.inbound.protection.outlook.com
  • 52.101.68.21 ↩ mail-db4pr02cu00205.inbound.protection.outlook.com
  • 52.101.68.29 ↩ mail-dbapr03cu00105.inbound.protection.outlook.com
  • 2a01:111:f403:ca04::9 ↩ mail-db7pr03cu00601.inbound.protection.outlook.com
  • 2a01:111:f403:ca09::c ↩ mail-as8pr05cu00304.inbound.protection.outlook.com
  • 2a01:111:f403:ca09::5 ↩ mail-am1pr04cu00105.inbound.protection.outlook.com
  • 2a01:111:f403:ca09::8 ↩ mail-as2pr05cu00100.inbound.protection.outlook.com

SOA Record

Raw SOA ns0.isd-internet.de domain.isd-internet.de 2022100405 28800 3600 604800 3600
Primary NS (mname)
ns0.isd-internet.de
Admin Email (rname)
domain@isd-internet.de
Serial
2022100405
Refresh
28800s
Retry
3600s
Expire
604800s
Minimum TTL
3600s

Nameservers (NS)

ns0.isd-internet.de
ns20.isd-internet.de

SPF Record

✓ Strict (-all)
v=spf1 a mx ip4:217.18.190.4 ip4:217.18.190.5 ip4:217.18.191.31 ip4:217.18.191.36 include:spf.protection.outlook.com -all
📊 DNS lookups: 3/10
✓ Hard fail (-all) — strict enforcement

DMARC Record

✗ Missing

No DMARC record — emails cannot be rejected on auth failure.

DKIM Selectors

✓ 2 found
selector1._domainkey
selector2._domainkey
✓ Public key: 216 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
  • SPFv=spf1 a mx ip4:217.18.190.4 ip4:217.18.190.5 ip4:217.18.191.31 ip4:217.18.191.36 include:spf.protection.outlook.com -all
  • google-site-verification=vzt4FTtkVSvxgsZKOyAcyI8S_DgL0StDzVzcNmCZwfY
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