Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
sw-systems.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-29 07:19:25 UTC · ↺ Refresh
MX Hostnames
- smtp.sw-systems.de
MX Priorities
- smtp.sw-systems.de: 10
A / AAAA Records
- 188.246.4.200 ↩ smtp.sw-systems.de
- 2a02:a00:e000:178:ec00:ff:fe00:3 (no PTR)
Mail Server IPs
- 188.246.4.200 ↩ smtp.sw-systems.de
- 2a02:a00:e000:178:ec00:ff:fe00:1 ↩ smtp.sw-systems.de
SOA Record
Raw SOA
nsa5.schlundtech.de hostmaster.sw-systems.de 2020052003 43200 7200 1209600 86400
Primary NS (mname)
nsa5.schlundtech.de
Admin Email (rname)
hostmaster@sw-systems.de
Serial
2020052003
Refresh
43200s
Retry
7200s
Expire
1209600s
Minimum TTL
86400s
Nameservers (NS)
nsb5.schlundtech.de
nsd5.schlundtech.de
nsc5.schlundtech.de
nsa5.schlundtech.de
SPF Record
✓ Strict (-all)
v=spf1 mx -all
📊 DNS lookups: 1/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✓ Reject
v=DMARC1; p=reject; rua=mailto:[email protected]
✓ Reject — strongest protection
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
DKIM Selectors
✓ 1 found
mail._domainkey
✓ Public key: 216 chars (valid)
✓ DKIM properly configured for selector: mail
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
1 record- SPFv=spf1 mx -all
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