Identity
25
D
nina-strauch.de
Posture Score: 68/100
Scanned May 10, 2026 at 5:11 AM UTC
Score History
Attack Surface
91
Reputation
88
Identity Findings
TLSA records without DNSSEC for mxext2.mailbox.org
DANE requires DNSSEC. Without it, TLSA records provide no security benefit and can be spoofed.
💡 Enable DNSSEC for the domain before relying on DANE/TLSA.
TLSA records without DNSSEC for mxext3.mailbox.org
DANE requires DNSSEC. Without it, TLSA records provide no security benefit and can be spoofed.
💡 Enable DNSSEC for the domain before relying on DANE/TLSA.
TLSA records without DNSSEC for mxext1.mailbox.org
DANE requires DNSSEC. Without it, TLSA records provide no security benefit and can be spoofed.
💡 Enable DNSSEC for the domain before relying on DANE/TLSA.
No DKIM records found
No DKIM records were found for any common selector. Email may not be authenticated.
💡 Configure DKIM signing and publish the public key at <selector>._domainkey.nina-strauch.de
Subdomains have no DMARC enforcement
No sp= tag set and p=none. Subdomains inherit the monitoring-only policy, leaving them open to spoofing.
💡 Add sp=reject (or sp=quarantine) to your DMARC record to protect subdomains.
DMARC policy is monitoring-only (p=none)
The p=none policy only monitors; it does not instruct receivers to quarantine or reject unauthenticated mail.
💡 Upgrade to p=quarantine or p=reject after reviewing aggregate reports.
No MTA-STS record found
Without MTA-STS, mail transport encryption cannot be enforced and is vulnerable to downgrade attacks.
💡 Publish a _mta-sts TXT record and host a policy file at https://mta-sts.nina-strauch.de/.well-known/mta-sts.txt
No TLS-RPT record found
Without TLS-RPT, you will not receive reports about TLS negotiation failures.
💡 Publish a _smtp._tls TXT record (e.g. "v=TLSRPTv1; rua=mailto:tls-reports@nina-strauch.de").
No CAA iodef tag configured
No iodef tag is present in the CAA records. CA policy violation reports will not be sent.
💡 Add an iodef CAA record. Example: 0 iodef "mailto:security@example.com"
Very low TTL on MX records: 222s
3 MX records have a TTL of 222s or less (below 300s).
💡 Increase the TTL to at least 300 seconds unless frequent changes are expected.
Very low TTL on SPF record: 222s
The SPF record has a TTL of 222s or less (below 300s).
💡 Increase the TTL to at least 300 seconds unless frequent changes are expected.
Very low TTL on DMARC record: 222s
The DMARC record has a TTL of 222s or less (below 300s).
💡 Increase the TTL to at least 300 seconds unless frequent changes are expected.
NS TTL mismatch between parent and authoritative zone
The NS record TTL in the parent zone (~7122s) differs significantly from the authoritative zone (~86400s).
💡 Align NS record TTLs between the parent zone delegation and the authoritative zone.
SPF record is valid
The SPF record is properly configured with valid syntax and within lookup limits.
SPF record length OK (31 bytes)
SPF record is within safe DNS packet size limits.
DKIM cryptographic configuration is compliant
No RFC 8301 compliance issues detected in DKIM key configuration.
No external DMARC report destinations
All DMARC report URIs point to the same domain — no external authorization needed.
No deprecated DMARCbis tags present
The DMARC record does not use any tags deprecated in DMARCbis (pct, rf, ri).
MX records are valid
All MX records are properly configured.
3 MX records with 3 unique IPs
Multiple MX records provide mail delivery redundancy.
ARC support likely available
MX server software appears to support ARC headers for authentication preservation.
Meets bulk sender authentication requirements
Domain has SPF, DKIM, and DMARC — meeting Google/Yahoo 2024 bulk sender requirements for email authentication.
SMTP security checks passed
No open relay, VRFY/EXPN, or banner disclosure issues detected.
SMTP RFC 5321 compliance checks passed
The mail server accepts postmaster@ and abuse@ and uses a valid FQDN in EHLO.
IPv6 readiness is good
IPv6 records are present and properly configured.
STARTTLS downgrade resistance is adequate
STARTTLS is supported with modern TLS and protected by MTA-STS and/or DANE.
NS delegation is properly configured
All nameservers are responsive, consistent, and properly secured.
DNS responses are consistent across all nameservers
All authoritative nameservers return consistent answers with proper AA flags.
DKIM2 not detected
No DKIM key record with v=2 was found across common selectors. DKIM2 is an emerging standard and not yet widely deployed.
DMARC alignment: adkim=r, aspf=r
DKIM alignment is relaxed, SPF alignment is relaxed.
DMARCbis np tag absent
The DMARC record does not include the np (non-existent subdomain policy) tag. Consider adding np=reject to protect non-existent subdomains under DMARCbis.
DMARCbis psd tag absent
The DMARC record does not include the psd (public suffix domain) indicator. Consider adding psd=n to explicitly identify this as an organizational domain.
REQUIRETLS not advertised
The primary MX does not advertise REQUIRETLS (RFC 8689). This is an emerging standard — MTA-STS and DANE provide adequate TLS enforcement for most deployments.
DANE/TLSA configured for mxext2.mailbox.org
TLSA records found and TLS certificate is available for verification.
DANE/TLSA configured for mxext3.mailbox.org
TLSA records found and TLS certificate is available for verification.
DANE/TLSA configured for mxext1.mailbox.org
TLSA records found and TLS certificate is available for verification.
No BIMI record found
BIMI is not configured. Your brand logo will not display in supporting email clients.
Open mail ports on mxext2.mailbox.org
Detected open mail-related ports: 25
RFC 8058 one-click unsubscribe assessment
No DKIM signing detected. RFC 8058 one-click unsubscribe requires DKIM-signed List-Unsubscribe headers.
MX IP network diversity
All MX IPs are in the same /16 network. Consider diversifying across networks for resilience.
SOA record parameters
Serial: 2026050401, Refresh: 10800s, Retry: 3600s, Expire: 604800s, Min TTL: 86400s
Authorized certificate authorities
CAA records restrict certificate issuance to: letsencrypt.org
Attack Surface Findings
Domain enumerability: medium
The domain has moderate enumerability. CT logs and DNS records reveal significant information about the domain structure.
💡 Restrict zone transfers, use NSEC3 instead of NSEC, consider wildcard certificates to reduce CT log exposure, and implement rate limiting on DNS queries.
DNSSEC is not enabled
No DNSKEY or DS records were found. DNS responses are not cryptographically authenticated.
💡 Enable DNSSEC by generating DNSKEY records and publishing DS records at the registrar.
DNS ANY query returns 11 record(s)
The DNS server responds to ANY queries with 11 record(s). The low record count limits amplification risk, but ANY responses still aid reconnaissance.
💡 Configure the DNS server to refuse or minimize ANY query responses per RFC 8482.
All MX records resolve correctly
No dangling MX records detected — all MX hostnames resolve to valid IP addresses.
Explicit MX records present
The domain has explicit MX records — no implicit A-record fallback delivery.
No internal information leakage detected
No non-routable IP addresses or internal references were found in public DNS records.
No email autodiscovery endpoints detected
No Microsoft Autodiscover, Mozilla Autoconfig, or email SRV records were found.
1 subdomain(s) discovered for nina-strauch.de
Subdomains were enumerated via Certificate Transparency logs, DNS wordlist brute-forcing, and DNS record analysis.
0 certificate(s) found in CT logs
Certificate Transparency logs contain 0 certificate(s) for nina-strauch.de and its subdomains. Each certificate reveals subdomain names.
Reputation Findings
Missing domain locks: clientTransferProhibited, clientDeleteProhibited
Domain nina-strauch.de is missing protective locks: clientTransferProhibited, clientDeleteProhibited.
💡 Enable clientTransferProhibited and clientDeleteProhibited locks through your registrar to prevent unauthorized transfers or deletions.
Missing Strict-Transport-Security on nina-strauch.de
The Strict-Transport-Security header is not set on https://nina-strauch.de.
💡 Add the Strict-Transport-Security header with a max-age of at least 31536000 (1 year) and include the includeSubDomains directive.
security.txt present
Found security.txt at https://nina-strauch.de/.well-known/security.txt.
TLS certificate valid for 85 days
Certificate for nina-strauch.de expires on 2026-08-03.
Certificate issued by R13
The certificate for nina-strauch.de is issued by a third-party CA.
Signature algorithm: rsa-sha256
The certificate for nina-strauch.de uses an acceptable signature algorithm.
RSA key: 4096 bits
The certificate for nina-strauch.de uses an adequate RSA key of 4096 bits.
SCTs present in certificate
The certificate for nina-strauch.de contains Signed Certificate Timestamps.
No weak ciphers detected
No known weak cipher suites detected on nina-strauch.de.
TLD has good reputation
The .de TLD is not on known abuse watchlists.
DMARC reporting destinations look legitimate
DMARC rua/ruf addresses do not point to known URL shortener services.
MX records point to stable infrastructure
No MX records point to known dynamic DNS service domains.
Strong TLS configuration on primary MX
Primary MX (mxext1.mailbox.org) uses TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 including Forward Secrecy.
SMTP banner matches infrastructure identity
The SMTP banner (mx2.mailbox.org) aligns with the MX hostname (mxext2.mailbox.org).
No registered typosquat domains detected
None of the common typosquat mutations of this domain appear to be registered by third parties.
Google Safe Browsing DNS check — no flag detected
DNS-based Safe Browsing lookup returned no results. Full verification requires the Google Safe Browsing API key.
Abuse contact lookup failed
Could not query abuse contact information.
PhishTank — API key required
PhishTank phishing database check requires an API key.
Sender Score — API key required
Sender Score reputation check requires an API key.
Cisco Talos — API key required
Cisco Talos IP reputation check requires an API key.
Could not connect to webmail.nina-strauch.de
HTTPS request to https://webmail.nina-strauch.de failed or timed out.
WHOIS registration data
Registrar: Unknown | Created: Unknown | Expires: Unknown | Updated: Unknown
WHOIS privacy protection not detected
Domain nina-strauch.de does not appear to have WHOIS privacy protection. Registrant details may be publicly visible.
Dependency Chains
DMARC Authentication Chain (SPF)
DMARC uses SPF to verify that emails come from authorized servers
SPF Record
SPF record found and configured
→
DMARC Policy
DMARC policy: none
DMARC Authentication Chain (DKIM)
DMARC uses DKIM to verify that emails have not been tampered with
DKIM Signature
DKIM signature missing
→
DMARC Policy
DMARC policy: none
⚠️ DKIM signature is missing. DMARC relies on DKIM to verify email integrity and prevent tampering. Without DKIM, DMARC alignment will fail for cryptographic verification.
Mail Server Identity: mxext2.mailbox.org
PTR record proves mail server legitimacy
MX: mxext2.mailbox.org
Mail server at 80.241.60.215
→
PTR Record
Reverse DNS: mx2.mailbox.org
Mail Server Identity: mxext3.mailbox.org
PTR record proves mail server legitimacy
MX: mxext3.mailbox.org
Mail server at 80.241.60.216
→
PTR Record
Reverse DNS: mx3.mailbox.org
Mail Server Identity: mxext1.mailbox.org
PTR record proves mail server legitimacy
MX: mxext1.mailbox.org
Mail server at 80.241.60.212
→
PTR Record
Reverse DNS: mx1.mailbox.org
Mail Server Reputation: mxext2.mailbox.org
RBL check ensures server is not blacklisted
MX: mxext2.mailbox.org
Mail server at 80.241.60.215
→
RBL Status
Not blacklisted
Mail Server Reputation: mxext3.mailbox.org
RBL check ensures server is not blacklisted
MX: mxext3.mailbox.org
Mail server at 80.241.60.216
→
RBL Status
Not blacklisted
Mail Server Reputation: mxext1.mailbox.org
RBL check ensures server is not blacklisted
MX: mxext1.mailbox.org
Mail server at 80.241.60.212
→
RBL Status
Not blacklisted
Enforced Encryption Chain
MTA-STS enforces TLS encryption to prevent man-in-the-middle attacks
TLS Support
Mail servers support TLS encryption
→
MTA-STS Policy
MTA-STS not configured
⚠️ MTA-STS policy is missing. Even with TLS support, you lack the enforcement layer that prevents attackers from stripping encryption (downgrade attacks).
Brand Identity Chain
BIMI displays your logo in email clients, but requires DMARC enforcement
DMARC Enforcement
DMARC not enforced (p=none or missing)
→
BIMI Record
BIMI not configured
⚠️ DMARC is not enforced. BIMI requires a DMARC policy of "quarantine" or "reject" to prove you have strong email authentication. Without enforcement, email clients will not display your logo.
TLS Monitoring Chain
TLS-RPT provides reports about TLS connection failures
TLS Support
Mail servers support TLS encryption
→
TLS-RPT Reporting
TLS-RPT not configured
⚠️ TLS-RPT is not configured. Without TLS reporting, you have no visibility into TLS connection failures that may be impacting email delivery.
Security Checks
MX Records
✓
SPF Record
✓
DKIM Record
✗
DMARC Policy
✓
BIMI Record
✗
CAA Records
✓
DNSSEC
✗
MTA-STS
✗
TLS-RPT
✗
Embed Badge
Display your domain's security grade on your website or README:
<img src="https://scan.ractermx.com/badge/nina-strauch.de.svg" alt="Email Security Grade">
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