c3.de

Valid Email Server
Domain Lookup › c3.de

Domain Overview

DNS: ✓ 2mo ago Checker: ✓ 2mo ago
c3.de
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No

Checked via [email protected] · 2026-04-04 01:20:43 UTC · ↺ Refresh

MX Hostnames

  • c3-de.mail.protection.outlook.com

MX Priorities

  • c3-de.mail.protection.outlook.com: 10

A / AAAA Records

  • 217.160.0.34 ↩ 217-160-0-34.elastic-ssl.ui-r.com
  • 2001:8d8:100f:f000::2e3 ↩ 2001-08d8-100f-f000-0000-0000-0000-02e3.elastic-ssl.ui-r.com

Mail Server IPs

  • 52.101.68.10 ↩ mail-dbbpr03cu00102.inbound.protection.outlook.com
  • 52.101.73.15 ↩ mail-am9pr04cu00107.inbound.protection.outlook.com
  • 52.101.73.12 ↩ mail-am4pr0401cu00104.inbound.protection.outlook.com
  • 52.101.73.8 ↩ mail-am0pr04cu00500.inbound.protection.outlook.com
  • 2a01:111:f403:ca09::5 ↩ mail-am1pr04cu00105.inbound.protection.outlook.com
  • 2a01:111:f403:ca09::d ↩ mail-as9pr05cu01305.inbound.protection.outlook.com
  • 2a01:111:f403:ca04::6 ↩ mail-db4pr02cu00406.inbound.protection.outlook.com
  • 2a01:111:f403:ca04::e ↩ mail-db8pr02cu00106.inbound.protection.outlook.com

SOA Record

Raw SOA ns1028.ui-dns.de hostmaster.1und1.de 2017051717 28800 7200 604800 300
Primary NS (mname)
ns1028.ui-dns.de
Admin Email (rname)
hostmaster@1und1.de
Serial
2017051717
Refresh
28800s
Retry
7200s
Expire
604800s
Minimum TTL
300s

Nameservers (NS)

ns1028.ui-dns.com
ns1028.ui-dns.biz
ns1028.ui-dns.de
ns1028.ui-dns.org

SPF Record

✓ Soft Fail (~all)
v=spf1 include:spf.protection.outlook.com ~all
📊 DNS lookups: 1/10
~ Soft fail (~all) — moderate enforcement

DMARC Record

✗ Missing

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

DKIM Selectors

✓ 2 found
selector1._domainkey
selector2._domainkey
✓ Public key: 392 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

4 records
  • _dmarc.c3.de 3600 IN TXT v=DMARC1; p=none
  • v=verifydomain MS=4323671
  • SPFv=spf1 include:spf.protection.outlook.com ~all
  • MS=1CFF6727E052431D69841C0A80B5E485A9967B7A
Full email verification for c3.de

Run SMTP check, SPF/DKIM/DMARC and catch-all detection.

SPF / DKIM / DMARC Get 1,000 Free Credits