guo.de

Valid Email Server
Domain Lookup › guo.de

Domain Overview

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

Checked via [email protected] · 2026-03-25 01:46:44 UTC · ↺ Refresh

MX Hostnames

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

MX Priorities

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

A / AAAA Records

  • 185.124.232.103 ↩ co103.cows-server.de

Mail Server IPs

  • 52.101.73.11 ↩ mail-am1pr04cu00103.inbound.protection.outlook.com
  • 52.101.73.1 ↩ mail-am3pr04cu00501.inbound.protection.outlook.com
  • 52.101.68.32 ↩ mail-db3pr0202cu00200.inbound.protection.outlook.com
  • 52.101.73.12 ↩ mail-am4pr0401cu00104.inbound.protection.outlook.com
  • 2a01:111:f403:ca04::c ↩ mail-db9pr02cu00204.inbound.protection.outlook.com
  • 2a01:111:f403:ca09::e ↩ mail-am7pr05cu00206.inbound.protection.outlook.com
  • 2a01:111:f403:ca04::8 ↩ mail-db5pr02cu00100.inbound.protection.outlook.com
  • 2a01:111:f403:ca09::9 ↩ mail-as8pr04cu00801.inbound.protection.outlook.com

SOA Record

Raw SOA dns01.cows.de hostmaster.guo.de 2024082200 3600 3600 1209600 86400
Primary NS (mname)
dns01.cows.de
Admin Email (rname)
hostmaster@guo.de
Serial
2024082200
Refresh
3600s
Retry
3600s
Expire
1209600s
Minimum TTL
86400s

Nameservers (NS)

dns01.cows.de
dns02.cows.de

SPF Record

✓ Strict (-all)
v=spf1 a mx ip4:185.124.232.103 include:5pf.cows-server.de include:spf.protection.outlook.com -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

✗ 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

1 record
  • SPFv=spf1 a mx ip4:185.124.232.103 include:5pf.cows-server.de include:spf.protection.outlook.com -all
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