isb-ag.de

Valid Email Server
Domain Lookup › isb-ag.de

Domain Overview

DNS: ✓ 2mo ago Checker: ✓ 2mo ago
isb-ag.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No

Checked via [email protected] · 2026-03-26 15:32:15 UTC · ↺ Refresh

MX Hostnames

  • mx1.isb-ag.de

MX Priorities

  • mx1.isb-ag.de: 10

A / AAAA Records

  • 81.26.169.136 ↩ customer.telemaxx.net

Mail Server IPs

  • 37.16.69.49 ↩ mx1.conet-isb.de

SOA Record

Raw SOA ns01.telemaxx.net do-not-reply.isb-ag.de 2026012602 43200 7200 1209600 86400
Primary NS (mname)
ns01.telemaxx.net
Admin Email (rname)
do-not-reply@isb-ag.de
Serial
2026012602
Refresh
43200s
Retry
7200s
Expire
1209600s
Minimum TTL
86400s

Nameservers (NS)

ns04.telemaxx.org
ns01.telemaxx.net
ns03.telemaxx.net
ns02.telemaxx.net

SPF Record

✓ Soft Fail (~all)
v=spf1 mx ~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

✗ 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

5 records
  • hv7qxb502kj7yfsrh0bmzssgc09xplgy
  • apple-domain-verification=dSMFpbl8LyYHRwmW
  • google-site-verification=R1gQqp1fGCeg_HG1pPdiKZmeCPvoRB-ywbWrZ0_Tk1M
  • MS=ms82166565
  • SPFv=spf1 mx ~all
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 isb-ag.de

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

No credit card required
Get 1,000 Free Credits