Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
ce21.de
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Did you mean: [email protected]
Checked via [email protected]
· 2026-03-19 14:31:26 UTC · ↺ Refresh
MX Hostnames
- ce21-de.mail.protection.outlook.com
MX Priorities
- ce21-de.mail.protection.outlook.com: 0
A / AAAA Records
- 217.160.0.108 ↩ 217-160-0-108.elastic-ssl.ui-r.com
- 2001:8d8:100f:f000::2ac ↩ 2001-08d8-100f-f000-0000-0000-0000-02ac.elastic-ssl.ui-r.com
Mail Server IPs
- 52.101.170.2 ↩ mail-fr6p281cu00202.inbound.protection.outlook.com
- 52.101.170.1 ↩ mail-fr4p281cu03101.inbound.protection.outlook.com
- 52.101.170.0 ↩ mail-fr5p281cu00500.inbound.protection.outlook.com
- 52.101.168.0 ↩ mail-beup281cu00100.inbound.protection.outlook.com
- 2a01:111:f403:ca2d:: ↩ mail-fr5p281cu00500.inbound.protection.outlook.com
- 2a01:111:f403:ca2d::2 ↩ mail-fr6p281cu00202.inbound.protection.outlook.com
- 2a01:111:f403:ca2d::1 ↩ mail-fr4p281cu03101.inbound.protection.outlook.com
- 2a01:111:f403:ca27:: ↩ mail-beup281cu00100.inbound.protection.outlook.com
SOA Record
Raw SOA
ns1106.ui-dns.com hostmaster.1und1.com 2017060127 28800 7200 604800 600
Primary NS (mname)
ns1106.ui-dns.com
Admin Email (rname)
hostmaster@1und1.com
Serial
2017060127
Refresh
28800s
Retry
7200s
Expire
604800s
Minimum TTL
600s
Nameservers (NS)
ns1056.ui-dns.de
ns1039.ui-dns.org
ns1045.ui-dns.biz
ns1106.ui-dns.com
SPF Record
✓ Strict (-all)
v=spf1 include:spf.protection.outlook.com -all
📊 DNS lookups: 1/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✗ p=none
v=DMARC1; p=none; rua=mailto:[email protected]; fo=1
⚠ p=none — monitoring only, no enforcement
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
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- MS=ms22676241
- SPFv=spf1 include:spf.protection.outlook.com -all
Full email verification for ce21.de
Run SMTP check, SPF/DKIM/DMARC and catch-all detection.
SPF / DKIM / DMARC Get 1,000 Free Credits