heistermann.de

Valid Email Server
Domain Lookup › heistermann.de

Domain Overview

DNS: ✓ 1mo ago Checker: ✓ 1mo ago
heistermann.de
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No

Checked via [email protected] · 2026-04-07 14:11:21 UTC · ↺ Refresh

MX Hostnames

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

MX Priorities

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

A / AAAA Records

  • 20.123.120.78 (no PTR)

Mail Server IPs

  • 52.101.170.0 ↩ mail-fr5p281cu00500.inbound.protection.outlook.com
  • 52.101.170.2 ↩ mail-fr6p281cu00202.inbound.protection.outlook.com
  • 52.101.170.1 ↩ mail-fr4p281cu03101.inbound.protection.outlook.com
  • 52.101.168.0 ↩ mail-beup281cu00100.inbound.protection.outlook.com
  • 2a01:111:f403:ca2d::2 ↩ mail-fr6p281cu00202.inbound.protection.outlook.com
  • 2a01:111:f403:ca27:: ↩ mail-beup281cu00100.inbound.protection.outlook.com
  • 2a01:111:f403:ca2d::1 ↩ mail-fr4p281cu03101.inbound.protection.outlook.com
  • 2a01:111:f403:ca2d:: ↩ mail-fr5p281cu00500.inbound.protection.outlook.com

SOA Record

Raw SOA ns1-05.azure-dns.com azuredns-hostmaster.microsoft.com 1 3600 300 2419200 300
Primary NS (mname)
ns1-05.azure-dns.com
Admin Email (rname)
azuredns-hostmaster@microsoft.com
Serial
1
Refresh
3600s
Retry
300s
Expire
2419200s
Minimum TTL
300s

Nameservers (NS)

ns3-05.azure-dns.org
ns4-05.azure-dns.info
ns1-05.azure-dns.com
ns2-05.azure-dns.net

SPF Record

✓ Strict (-all)
v=spf1 include:spf.protection.outlook.com include:spf-de.emailsignatures365.com -all
📊 DNS lookups: 2/10
✓ Hard fail (-all) — strict 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

8 records
  • MS=ms16047507
  • apple-domain-verification=G7v5SUbl62KVMddg
  • mscid=TyUu4uyt6fJTcfsSd5PVg9Ziiu7kYS6+FWvBU1Qag5bNYlEsk/zobksWrNPtLSxJtvmnNGHlzmka73ti2DUcNA==
  • openai-domain-verification=dv-3Kh41vIoFAxYzYwrP3yuBE75
  • _acme-challenge=LpHom3qBtChxCyxe4DwC7EYRZ2xQPst1U9VGFENoLQk
  • _acme-challenge=MeSY561q6MJMb13K92QGUoE4xXblxh97Laz6DfAnqEA
  • _dmarc=v=DMARC1; p=reject;
  • SPFv=spf1 include:spf.protection.outlook.com include:spf-de.emailsignatures365.com -all
Full email verification for heistermann.de

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

SPF / DKIM / DMARC Get 1,000 Free Credits