Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
rbb-dortmund.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-24 15:25:04 UTC · ↺ Refresh
MX Hostnames
- mx4.in-berlin.de
- mx3.in-berlin.de
- mx1.in-berlin.de
- mx2.in-berlin.de
MX Priorities
- mx3.in-berlin.de: 30
- mx1.in-berlin.de: 10
- mx4.in-berlin.de: 40
- mx2.in-berlin.de: 20
A / AAAA Records
- 89.31.143.90 (no PTR)
Mail Server IPs
- 192.109.42.28 ↩ tamarau.in-berlin.de
- 193.29.188.9 ↩ bubalus.in-berlin.de
- 217.197.80.23 ↩ mindoro.in-berlin.de
- 130.133.8.35 ↩ methan2.in-berlin.de
- 2001:67c:1400:1010::23 ↩ mindoro.in-berlin.de
- 2001:67c:1400:1010::42:28 ↩ tamarau.in-berlin.de
- 2001:67c:1403:1010::9 ↩ bubalus.in-berlin.de
SOA Record
Raw SOA
ns.udag.de hostmaster.united-domains.de 2024032114 10800 3600 604800 3600
Primary NS (mname)
ns.udag.de
Admin Email (rname)
hostmaster@united-domains.de
Serial
2024032114
Refresh
10800s
Retry
3600s
Expire
604800s
Minimum TTL
3600s
Nameservers (NS)
ns.udag.de
ns.udag.org
ns.udag.net
SPF Record
✓ Soft Fail (~all)
v=spf1 a mx ip4:81.7.14.216 ip4:192.109.42.28 ip4:192.109.42.6 ip4:217.197.80.23 ip4:193.29.188.9 ip4:130.133.8.35 ip6:2001:67c:1400:1010::42:6 ip6:2a02:180:6:1::442f ip6:2001:67c:1403:1010::9 ip6:2001:67c:1400:1010::23 ip6:2001:67c:1400:1010::42:28 ip6:2001:470:1f13:f3::35 ~all
📊 DNS lookups: 2/10
~ Soft fail (~all) — moderate enforcement
DMARC Record
✗ MissingNo DMARC record — emails cannot be rejected on auth failure.
DKIM Selectors
✗ None detectedNo 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 a mx ip4:81.7.14.216 ip4:192.109.42.28 ip4:192.109.42.6 ip4:217.197.80.23 ip4:193.29.188.9 ip4:130.133.8.35 ip6:2001:67c:1400:1010::42:6 ip6:2a02:180:6:1::442f ip6:2001:67c:1403:1010::9 ip6:2001:67c:1400:1010::23 ip6:2001:67c:1400:1010::42:28 ip6:2001:470:1f13:f3::35 ~all
- MS=D93CDD1397814105BD7598C772C331CF4C4C4813
- google-site-verification=kCt1TvBjuq-6MOVXevy9MG5QsEPP1OXEgIMOkNQFJIU
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 rbb-dortmund.de
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits