Skill UI

A comprehensive, step-by-step checklist and audit script designed for validating Customer.io integrations before going live. It covers credential verification, email deliverability setup (SPF, DKIM, DMARC), API connectivity smoke tests, campaign readiness, and setting up operational monitoring alerts for a smooth, reliable production launch.

Audits a domain’s email authentication by querying SPF, DKIM, and DMARC DNS records using dnspython, validating syntax/counts, flagging common spoofing risks, and producing remediation guidance.

This expert playbook covers advanced techniques for email header injection and authentication bypass. It details exploiting CRLF vulnerabilities in SMTP headers (e.g., BCC/CC injection, body control) and bypassing modern email security standards like SPF, DKIM, and DMARC. Essential for penetration testing of contact forms, email APIs, and password reset workflows.

This guide details the process of adding, verifying, and publishing necessary DNS records (SPF, DKIM, DMARC) for a custom sending domain in Mailtrap. It covers both manual compliance steps via the UI and programmatic automation through the Sending Domains API. Essential for ensuring high email deliverability and authentication compliance.

A comprehensive guide and toolkit for digital forensics experts to parse and analyze raw email headers (Received, Message-ID, etc.). This method traces the true origin of suspicious emails, validates sender authenticity by analyzing SPF, DKIM, and DMARC records, and confirms or rules out email spoofing attempts. Essential for incident response and phishing investigation.

A comprehensive guide for integrating transactional email sending into applications using Mailtrap's Email API. It covers critical best practices, including separating development (Sandbox) and production environments, implementing secure Bearer token authentication, and performing essential domain verification (SPF, DKIM, DMARC). Use this when building features like password resets or debugging email delivery pipelines.

Analyzes published DNS TXT records (SPF, DMARC, DKIM, BIMI) to produce a priority-ordered spoofability verdict for a domain. Distinguishes envelope MAIL FROM from header From, handles SPF PermError and include-chain takeover risks, and explains why SPF -all alone is insufficient without DMARC enforcement. Use for security audits and phishing feasibility assessments.