retarus.de

Valid Email Server
Domain Lookup › retarus.de

Domain Overview

DNS: ✓ 2mo ago Checker: ✓ 2mo ago
retarus.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No

Checked via [email protected] · 2026-03-30 22:21:59 UTC · ↺ Refresh

MX Hostnames

  • mx-78950368.mail.eu.retarus.com

MX Priorities

  • mx-78950368.mail.eu.retarus.com: 10

A / AAAA Records

  • 178.63.70.247 ↩ static.247.70.63.178.clients.your-server.de

Mail Server IPs

  • 94.199.92.130 ↩ mx-in01.eu.retarus.com
  • 94.199.89.39 ↩ mx-in02.eu.retarus.com

SOA Record

Raw SOA ns-175.awsdns-21.com awsdns-hostmaster.amazon.com 20250602 7200 900 1209600 86400
Primary NS (mname)
ns-175.awsdns-21.com
Admin Email (rname)
awsdns-hostmaster@amazon.com
Serial
20250602
Refresh
7200s
Retry
900s
Expire
1209600s
Minimum TTL
86400s

Nameservers (NS)

ns-873.awsdns-45.net
ns-1223.awsdns-24.org
ns-1716.awsdns-22.co.uk
ns-175.awsdns-21.com

SPF Record

✓ Strict (-all)
v=spf1 include:_spf.retarus.com include:stspg-customer.com -all
📊 DNS lookups: 2/10
✓ Hard fail (-all) — strict enforcement

DMARC Record

✗ p=none
v=DMARC1; p=none; rua=mailto:[email protected]
⚠ p=none — monitoring only, no enforcement
📋 SPF alignment: Relaxed · DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]

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

7 records
  • swisssign-check=D9mSoi8mNWXc1ZQFHYQQKggGgdw
  • SPFv=spf1 include:_spf.retarus.com include:stspg-customer.com -all
  • MS=ms20785573
  • MS=ms73987071
  • _fr2eovcymf58nb6s9upu04dquueslj2
  • google-site-verification=xykW0Imq7FIbNHXYcS1-Maqya4FEfHgo6mugl-Fj28A
  • retarus GmbH
Free · No signup required
Add email validation to your forms

Block disposable emails, validate MX records, detect role accounts — unlimited, forever free.

<script src="https://check.verifyswift.com/"></script>
One line of code · Works on any site
See demo & docs
Deep verification
Full email verification for retarus.de

SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.

No credit card required
Get 1,000 Free Credits