Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
stsystems.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-27 17:11:51 UTC · ↺ Refresh
MX Hostnames
- mail.shdhpf.de
MX Priorities
- mail.shdhpf.de: 10
A / AAAA Records
- 217.160.0.55 ↩ 217-160-0-55.elastic-ssl.ui-r.com
- 2001:8d8:100f:f000::200 ↩ 2001-08d8-100f-f000-0000-0000-0000-0200.elastic-ssl.ui-r.com
Mail Server IPs
- 89.58.130.48 ↩ mail.shdhpf.de
SOA Record
Raw SOA
ns1090.ui-dns.biz hostmaster.1und1.com 2017060147 28800 7200 604800 600
Primary NS (mname)
ns1090.ui-dns.biz
Admin Email (rname)
hostmaster@1und1.com
Serial
2017060147
Refresh
28800s
Retry
7200s
Expire
604800s
Minimum TTL
600s
Nameservers (NS)
ns1049.ui-dns.com
ns1055.ui-dns.org
ns1045.ui-dns.de
ns1090.ui-dns.biz
SPF Record
✓ Strict (-all)
v=spf1 mx:stsystems.de -all
📊 DNS lookups: 1/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✓ Reject
v=DMARC1; p=reject; ruf=mailto:[email protected]
✓ Reject — strongest protection
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
⚠ No aggregate reports (rua= not set)
DKIM Selectors
✓ 1 found
dkim._domainkey
✓ Public key: 392 chars (valid)
✓ DKIM properly configured for selector: dkim
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
2 records- 202208111138583c8hvbf2my26j9fdrwd7wepsm7a81xdm2wba3d4sy4nsx0qexp
- SPFv=spf1 mx:stsystems.de -all
Full email verification for stsystems.de
Run SMTP check, SPF/DKIM/DMARC and catch-all detection.
SPF / DKIM / DMARC Get 1,000 Free Credits