a-c-u.de

Valid Email Server
Domain Lookup › a-c-u.de

Domain Overview

DNS: ✓ 2mo ago Checker: ✓ 2mo ago
a-c-u.de
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No

Checked via [email protected] · 2026-03-31 23:37:00 UTC · ↺ Refresh

MX Hostnames

  • acu-de0k.mail.protection.outlook.com

MX Priorities

  • acu-de0k.mail.protection.outlook.com: 10

A / AAAA Records

  • 13.248.155.104 ↩ a20b9ee60132ef283.awsglobalaccelerator.com
  • 76.223.27.102 ↩ a20b9ee60132ef283.awsglobalaccelerator.com

Mail Server IPs

  • 52.101.73.6 ↩ mail-am6pr04cu00306.inbound.protection.outlook.com
  • 52.101.73.26 ↩ mail-as9pr05cu01302.inbound.protection.outlook.com
  • 52.101.73.30 ↩ mail-am7pr05cu00306.inbound.protection.outlook.com
  • 52.101.68.3 ↩ mail-db7pr03cu00403.inbound.protection.outlook.com
  • 2a01:111:f403:ca04:: ↩ mail-db3pr0202cu00100.inbound.protection.outlook.com
  • 2a01:111:f403:ca09::d ↩ mail-as9pr05cu01305.inbound.protection.outlook.com
  • 2a01:111:f403:ca09::6 ↩ mail-am4pr0401cu00106.inbound.protection.outlook.com
  • 2a01:111:f403:ca04::8 ↩ mail-db5pr02cu00100.inbound.protection.outlook.com

SOA Record

Raw SOA ns1.domaindiscount24.net tech.key-systems.net 2023051206 10800 3600 604800 28800
Primary NS (mname)
ns1.domaindiscount24.net
Admin Email (rname)
tech@key-systems.net
Serial
2023051206
Refresh
10800s
Retry
3600s
Expire
604800s
Minimum TTL
28800s

Nameservers (NS)

ns1.domaindiscount24.net
ns3.domaindiscount24.net
ns2.domaindiscount24.net

SPF Record

✓ Strict (-all)
v=spf1 include:spf.protection.outlook.com -all
📊 DNS lookups: 1/10
✓ 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

3 records
  • SPFv=spf1 include:spf.protection.outlook.com -all
  • google-site-verification=AnnmAELjyP66VJB6ZfKLIoD9VwChR38TEZDDz8VaokM
  • MS=ms91155891
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