Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
stlu.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Did you mean: [email protected]
Checked via [email protected]
· 2026-03-31 18:57:42 UTC · ↺ Refresh
MX Hostnames
- alpha.stlu.de
MX Priorities
- alpha.stlu.de: 10
A / AAAA Records
- 193.31.25.20 ↩ bravo.mp94.de
- 2a03:4000:2b:1ec8:: ↩ bravo.mp94.de
Mail Server IPs
- 37.221.196.158 ↩ alpha.stlu.de
- 2a03:4000:9:53d::1 ↩ alpha.stlu.de
SOA Record
Raw SOA
root-dns.netcup.net dnsadmin.netcup.net 2026032608 28800 7200 1209600 300
Primary NS (mname)
root-dns.netcup.net
Admin Email (rname)
dnsadmin@netcup.net
Serial
2026032608
Refresh
28800s
Retry
7200s
Expire
1209600s
Minimum TTL
300s
Nameservers (NS)
root-dns.netcup.net
second-dns.netcup.net
third-dns.netcup.net
SPF Record
✓ Strict (-all)
v=spf1 mx -all
📊 DNS lookups: 1/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✓ Reject
v=DMARC1; p=reject;
✓ 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
1 record- SPFv=spf1 mx -all
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