Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
fs123.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Did you mean: [email protected]
Checked via [email protected]
· 2026-04-01 18:03:55 UTC · ↺ Refresh
MX Hostnames
- mx.petricore.is
MX Priorities
- mx.petricore.is: 10
A / AAAA Records
- 185.165.170.51 ↩ mx01.petricore.is
Mail Server IPs
- 37.235.49.88 ↩ mx.petricore.is
- 2a03:f80:354:37:235:49:88:1 ↩ mx.petricore.is
SOA Record
Raw SOA
nsa7.schlundtech.de dirkheidrich.gmail.com 2021090200 43200 7200 1209600 86400
Primary NS (mname)
nsa7.schlundtech.de
Admin Email (rname)
dirkheidrich@gmail.com
Serial
2021090200
Refresh
43200s
Retry
7200s
Expire
1209600s
Minimum TTL
86400s
Nameservers (NS)
nsc7.schlundtech.de
nsa7.schlundtech.de
nsd7.schlundtech.de
nsb7.schlundtech.de
SPF Record
✓ Strict (-all)
v=spf1 +a +mx +a:mx.petricore.is -all
📊 DNS lookups: 4/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✗ p=none
v=DMARC1; p=none;
⚠ p=none — monitoring only, no enforcement
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
⚠ No aggregate reports (rua= not set)
DKIM Selectors
✓ 1 found
default._domainkey
✓ Public key: 216 chars (valid)
✓ DKIM properly configured for selector: default
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
1 record- SPFv=spf1 +a +mx +a:mx.petricore.is -all
Full email verification for fs123.de
Run SMTP check, SPF/DKIM/DMARC and catch-all detection.
SPF / DKIM / DMARC Get 1,000 Free Credits