Identity
73
B
comixology.com
Posture Score: 82/100
Scanned May 9, 2026 at 3:37 AM UTC
Score History
Attack Surface
90
Reputation
84
Identity Findings
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.comixology.com
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.comixology.com/.well-known/mta-sts.txt
STARTTLS without MTA-STS or DANE protection
STARTTLS alone is vulnerable to downgrade attacks. Neither MTA-STS nor DANE is configured to enforce encryption.
💡 Deploy MTA-STS and/or DANE to protect against STARTTLS stripping attacks.
No CAA records found
No CAA records are configured. Any certificate authority can issue certificates for this domain.
💡 Add CAA records to restrict certificate issuance. Example: 0 issue "letsencrypt.org"
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.
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@comixology.com").
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.
Very low TTL on MX record: 41s
The MX record has a TTL of 41s or less (below 300s).
💡 Increase the TTL to at least 300 seconds unless frequent changes are expected.
Very low TTL on A records: 60s
3 A records have a TTL of 60s or less (below 300s).
💡 Increase the TTL to at least 300 seconds unless frequent changes are expected.
Very low TTL on DMARC record: 41s
The DMARC record has a TTL of 41s 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 (~7181s) differs significantly from the authoritative zone (~172800s).
💡 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.
DKIM cryptographic configuration is compliant
No RFC 8301 compliance issues detected in DKIM key configuration.
All external report destinations authorized
External DMARC report destinations have valid authorization records per RFC 7489 §7.1.
Subdomains protected (sp=quarantine)
DMARC subdomain policy enforces quarantine or reject on unauthenticated subdomain mail.
MX records are valid
All MX records are properly configured.
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.
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.
Deprecated DMARCbis tags found: pct
The DMARC record contains tags deprecated in DMARCbis: pct. Consider removing these for forward compatibility.
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.
No DANE/TLSA records found
DANE is not configured for any MX server. This is optional but provides strong certificate binding.
No BIMI record found
BIMI is not configured. Your brand logo will not display in supporting email clients.
Open mail ports on amazon-smtp.amazon.com
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: 1, Refresh: 7200s, Retry: 900s, Expire: 1209600s, Min TTL: 86400s
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.
Software/version information in TXT record
A TXT record contains a software identifier or version string: "64.124.30".
💡 Review TXT records and remove unnecessary software version information.
DNS ANY query returns 18 record(s)
The DNS server responds to ANY queries with 18 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.
16 subdomain(s) discovered for comixology.com
Subdomains were enumerated via Certificate Transparency logs, DNS wordlist brute-forcing, and DNS record analysis.
218 certificate(s) found in CT logs
Certificate Transparency logs contain 218 certificate(s) for comixology.com and its subdomains. Each certificate reveals subdomain names.
Reputation Findings
SMTP banner mismatch: cluster01.us-west-2.mail-perimeter.amazon.com
The SMTP banner identifies as 'cluster01.us-west-2.mail-perimeter.amazon.com' but the MX hostname is 'amazon-smtp.amazon.com' and PTR resolves to 'smtp02.us-west-2.mail-perimeter.amazon.com'. Microsoft and other receivers flag this mismatch as suspicious infrastructure.
💡 Configure the SMTP server banner to match the MX hostname or PTR record (amazon-smtp.amazon.com).
Typosquat detected: ocmixology.com (has MX!), comixolgy.com, xomixology.com, domixology.com, vomixology.com
11 registered lookalike domain(s) that could be used for phishing against your brand. Showing top 5 of 11. Domains with MX records can send and receive email, making them high-risk phishing vectors.
💡 Consider registering common typosquats defensively, or monitor them for abuse. Domains with MX records are highest risk as they can send/receive phishing email.
HSTS enabled with preload on comixology.com
Strict-Transport-Security: max-age=47474747; includeSubDomains; preload
security.txt present
Found security.txt at https://comixology.com/.well-known/security.txt.
TLS certificate valid for 285 days
Certificate for comixology.com expires on 2027-02-18.
Certificate issued by Amazon RSA 2048 M04
The certificate for comixology.com is issued by a third-party CA.
Signature algorithm: rsa-sha256
The certificate for comixology.com uses an acceptable signature algorithm.
RSA key: 2048 bits
The certificate for comixology.com uses an adequate RSA key of 2048 bits.
SCTs present in certificate
The certificate for comixology.com contains Signed Certificate Timestamps.
No weak ciphers detected
No known weak cipher suites detected on comixology.com.
Domain valid for 330 days
Domain comixology.com expires on 2027-04-05.
Domain transfer and delete locks enabled
Domain comixology.com has clientTransferProhibited and clientDeleteProhibited locks.
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 (amazon-smtp.amazon.com) uses TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 including Forward Secrecy.
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.comixology.com
HTTPS request to https://webmail.comixology.com failed or timed out.
WHOIS registration data
Registrar: MarkMonitor Inc. | Created: 2007-04-05 | Expires: 2027-04-05 | Updated: 2026-01-31
WHOIS privacy protection not detected
Domain comixology.com 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 missing
→
DMARC Policy
DMARC policy: quarantine
⚠️ SPF record is missing. DMARC relies on SPF to verify sender authorization. Without SPF, DMARC alignment will fail, reducing email deliverability and brand protection.
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: amazon-smtp.amazon.com
PTR record proves mail server legitimacy
MX: amazon-smtp.amazon.com
Mail server at 52.28.202.117
→
PTR Record
Reverse DNS: smtp01.eu-central-1.mail-perimeter.amazon.com
Mail Server Reputation: amazon-smtp.amazon.com
RBL check ensures server is not blacklisted
MX: amazon-smtp.amazon.com
Mail server at 52.28.202.117
→
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 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-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/comixology.com.svg" alt="Email Security Grade">
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