rtsb.de

Valid Email Server
Domain Lookup › rtsb.de

Domain Overview

DNS: ✓ 2mo ago Checker: ✓ 2mo ago
rtsb.de
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Did you mean: [email protected]

Checked via [email protected] · 2026-03-20 05:36:23 UTC · ↺ Refresh

MX Hostnames

  • rtsb-de.mail.protection.outlook.com

MX Priorities

  • rtsb-de.mail.protection.outlook.com: 0

A / AAAA Records

  • 80.237.130.131 ↩ wp609.webpack.hosteurope.de

Mail Server IPs

  • 52.101.68.27 ↩ mail-db7pr03cu00503.inbound.protection.outlook.com
  • 52.101.68.39 ↩ mail-db7pr03cu00607.inbound.protection.outlook.com
  • 52.101.68.12 ↩ mail-db9pr02cu00204.inbound.protection.outlook.com
  • 52.101.73.15 ↩ mail-am9pr04cu00107.inbound.protection.outlook.com
  • 2a01:111:f403:ca09::8 ↩ mail-as2pr05cu00100.inbound.protection.outlook.com
  • 2a01:111:f403:ca09::20 ↩ mail-as8pr05cu00400.inbound.protection.outlook.com
  • 2a01:111:f403:ca09::7 ↩ mail-am9pr04cu00107.inbound.protection.outlook.com
  • 2a01:111:f403:ca04::f ↩ mail-db7pr03cu00507.inbound.protection.outlook.com

SOA Record

Raw SOA ns1.domainit.de hostmaster.domainit.de 2025082915 14400 3600 604800 28800
Primary NS (mname)
ns1.domainit.de
Admin Email (rname)
hostmaster@domainit.de
Serial
2025082915
Refresh
14400s
Retry
3600s
Expire
604800s
Minimum TTL
28800s

Nameservers (NS)

ns2.domainit.de
ns1.domainit.de

SPF Record

✓ Strict (-all)
v=spf1 include:spf.protection.outlook.com include:_spf.mlsend.com include:sendgrid.net include:spf-de.emailsignatures365.com ip4:80.155.2.216/30 ip4:52.58.247.199/32 -all
📊 DNS lookups: 4/10
✓ Hard fail (-all) — strict enforcement

DMARC Record

✗ Missing

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

DKIM Selectors

✓ 4 found
selector1._domainkey
selector2._domainkey
s1._domainkey
s2._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

1 record
  • SPFv=spf1 include:spf.protection.outlook.com include:_spf.mlsend.com include:sendgrid.net include:spf-de.emailsignatures365.com ip4:80.155.2.216/30 ip4:52.58.247.199/32 -all
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