joernkrebs.de

Valid Email Server
Domain Lookup › joernkrebs.de

Domain Overview

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

Checked via [email protected] · 2026-04-01 15:08:08 UTC · ↺ Refresh

MX Hostnames

  • mail.smartbyte.de

MX Priorities

  • mail.smartbyte.de: 10

A / AAAA Records

  • 157.90.156.95 ↩ smartbyte.de
  • 2a01:4f8:c010:151c::1 ↩ smartbyte.de

Mail Server IPs

  • 157.90.156.95 ↩ smartbyte.de
  • 2a01:4f8:c010:151c::1 ↩ smartbyte.de

SOA Record

Raw SOA ns.joernkrebs.de jk.smartbyte.de 1774513803 3600 3600 604800 86400
Primary NS (mname)
ns.joernkrebs.de
Admin Email (rname)
jk@smartbyte.de
Serial
1774513803
Refresh
3600s
Retry
3600s
Expire
604800s
Minimum TTL
86400s

Nameservers (NS)

ns.joernkrebs.de
ns2.he.net
ns3.he.net
ns4.he.net
ns5.he.net

SPF Record

✓ Strict (-all)
v=spf1 ip4:157.90.156.95 ip4:150.107.75.129 ip6:2a01:4f8:c010:151c::1 ip6:2404:9400:1:0:216:3eff:fef1:8722 mx:mail.smartbyte.de include:_spf.google.com a:joernkrebs.de a:smartbyte.de -all
📊 DNS lookups: 4/10
✓ Hard fail (-all) — strict enforcement

DMARC Record

~ Quarantine
v=DMARC1; p=quarantine; sp=quarantine; rua=mailto:[email protected]
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed · DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
↳ Subdomain policy: quarantine

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

2 records
  • google-site-verification=6QOx0ZF1cj8jz6NKTtoqBOTXaC0RoBeFXDBSlud19EA
  • SPFv=spf1 ip4:157.90.156.95 ip4:150.107.75.129 ip6:2a01:4f8:c010:151c::1 ip6:2404:9400:1:0:216:3eff:fef1:8722 mx:mail.smartbyte.de include:_spf.google.com a:joernkrebs.de a:smartbyte.de -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 joernkrebs.de

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

No credit card required
Get 1,000 Free Credits