Identity
92
B
tuta.com
Posture Score: 89/100
Scanned May 9, 2026 at 4:41 AM UTC
Score History
Attack Surface
91
Reputation
84
Identity Findings
No DMARC aggregate report URI (rua=)
Without rua=, you will not receive aggregate reports about authentication results.
💡 Add rua=mailto:dmarc-reports@tuta.com to your DMARC record.
Single MX record — no redundancy
Only one MX record exists. If this mail server goes down, all inbound mail will bounce. Most production mail systems use 2+ MX records with different priorities.
💡 Add a secondary MX record with a higher priority number (e.g., priority 20) pointing to a backup mail server.
ARC support not detected
No evidence of ARC (Authenticated Received Chain) support on MX servers. Forwarded messages may lose authentication.
💡 Consider enabling ARC signing on your mail servers to preserve authentication through forwarding.
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"
Slow DNS response from ns-150.awsdns-18.com: 2085.1ms
The nameserver ns-150.awsdns-18.com responded in 2085.1ms, exceeding the 500ms threshold.
💡 Investigate network latency or performance issues on ns-150.awsdns-18.com.
SPF record is valid
The SPF record is properly configured with valid syntax and within lookup limits.
SPF record length OK (35 bytes)
SPF record is within safe DNS packet size limits.
DKIM records are valid
DKIM records found and validated for selectors: s1, s2
DKIM cryptographic configuration is compliant
No RFC 8301 compliance issues detected in DKIM key configuration.
DKIM key strength indicates modern key management
All DKIM keys use RSA-2048+ or Ed25519, consistent with current best practices.
No external DMARC report destinations
All DMARC report URIs point to the same domain — no external authorization needed.
Subdomains protected (sp=quarantine)
DMARC subdomain policy enforces quarantine or reject on unauthenticated subdomain mail.
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.
MTA-STS and TLS-RPT are properly configured
MTA-STS policy is enforced and TLS reporting is configured.
TLS-RPT report destinations are reachable
All TLS-RPT rua= URIs point to resolvable domains.
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 TTL values follow best practices
All critical DNS record TTLs are within recommended ranges.
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=s, aspf=r
DKIM alignment is strict, 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 mail.tutanota.de
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 mail.tutanota.de
Detected open mail-related ports: 25
RFC 8058 one-click unsubscribe assessment
DKIM signing is configured. RFC 8058 compliance depends on List-Unsubscribe and List-Unsubscribe-Post headers being included in outbound messages and DKIM signatures.
MX IP network diversity
All MX IPs are in the same /16 network. Consider diversifying across networks for resilience.
SOA record parameters
Serial: 1, Refresh: 7200s, Retry: 900s, Expire: 1209600s, Min TTL: 86400s
Authorized certificate authorities
CAA records restrict certificate issuance to: letsencrypt.org, sectigo.com
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.
No NSEC/NSEC3 records found
Neither NSEC nor NSEC3 records were found. Authenticated denial of existence is not configured.
💡 Configure NSEC3 records for authenticated denial of existence while preventing zone enumeration.
DNS ANY query returns 16 record(s)
The DNS server responds to ANY queries with 16 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.
4 subdomain(s) discovered for tuta.com
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 tuta.com and its subdomains. Each certificate reveals subdomain names.
DNSSEC is enabled
DNSKEY and/or DS records are present, indicating DNSSEC is configured.
Reputation Findings
Domain expires in 34 days
Domain tuta.com expires on 2026-06-13 (34 days).
💡 Renew the domain registration soon — it expires within 60 days. Enable auto-renewal if available.
Missing domain locks: clientDeleteProhibited
Domain tuta.com is missing protective locks: clientDeleteProhibited.
💡 Enable clientTransferProhibited and clientDeleteProhibited locks through your registrar to prevent unauthorized transfers or deletions.
HSTS enabled with preload on tuta.com
Strict-Transport-Security: max-age=63072000; includeSubDomains; preload
security.txt present
Found security.txt at https://tuta.com/.well-known/security.txt.
TLS certificate valid for 48 days
Certificate for tuta.com expires on 2026-06-26.
Certificate issued by E7
The certificate for tuta.com is issued by a third-party CA.
Signature algorithm: ecdsa-with-sha384
The certificate for tuta.com uses an acceptable signature algorithm.
ECC key: 256 bits
The certificate for tuta.com uses an adequate ECC key of 256 bits.
SCTs present in certificate
The certificate for tuta.com contains Signed Certificate Timestamps.
No weak ciphers detected
No known weak cipher suites detected on tuta.com.
TLD has good reputation
The .com 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 (mail.tutanota.de) uses TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 including Forward Secrecy.
SMTP banner matches infrastructure identity
The SMTP banner (mail.w14.tutanota.de) aligns with the MX hostname (mail.tutanota.de).
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.tuta.com
HTTPS request to https://webmail.tuta.com failed or timed out.
WHOIS registration data
Registrar: INWX GmbH | Created: 1997-06-14 | Expires: 2026-06-13 | Updated: 2025-06-14
WHOIS privacy protection enabled
Domain tuta.com has WHOIS privacy/redaction enabled.
Typosquat detected: uta.com (has MX!), tta.com (has MX!), tut.com (has MX!), utta.com (has MX!), tuat.com (has MX!)
25 registered lookalike domain(s) that could be used for phishing against your brand. Showing top 5 of 25. Domains with MX records can send and receive email, making them high-risk phishing vectors.
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: quarantine
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: quarantine
⚠️ 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: mail.tutanota.de
PTR record proves mail server legitimacy
MX: mail.tutanota.de
Mail server at 185.205.69.214
→
PTR Record
Reverse DNS: mail.w14.tutanota.de
Mail Server Reputation: mail.tutanota.de
RBL check ensures server is not blacklisted
MX: mail.tutanota.de
Mail server at 185.205.69.214
→
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
Mode: enforce
Brand Identity Chain
BIMI displays your logo in email clients, but requires DMARC enforcement
DMARC Enforcement
DMARC policy: quarantine
→
BIMI Record
BIMI not configured
⚠️ BIMI record is missing. Even with DMARC enforcement, you need to configure BIMI to display your brand logo in supported email clients.
TLS Monitoring Chain
TLS-RPT provides reports about TLS connection failures
TLS Support
Mail servers support TLS encryption
→
TLS-RPT Reporting
TLS failure reporting configured
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/tuta.com.svg" alt="Email Security Grade">
Want to re-scan this domain for updated results?
Scan tuta.com Again