domain-authentication

What problem does it solve?

Missing or misconfigured email authentication protocols (SPF, DKIM, DMARC) cause emails to be rejected, land in spam folders, fail compliance with Google/Yahoo/Microsoft bulk sender rules, and leave domains vulnerable to spoofing attacks. This Skill provides end-to-end guidance to implement, verify, and troubleshoot email authentication for any sending domain.

Core Features & Use Cases

• Full authentication stack configuration: Step-by-step instructions for setting up SPF, DKIM, and DMARC records for new sending domains, including DNS record formatting and alignment requirements.
• Troubleshooting and debugging: Guidance for resolving common authentication failures such as SPF DNS lookup limit overages, DKIM key rotation issues, and SaaS tool envelope-from misconfigurations that break DMARC alignment.
• Compliance and security: Includes bulk sender requirement checklists, non-sending domain lockdown steps to prevent spoofing, and optional advanced protocol guidance for MTA-STS and BIMI.
• Use Case: A marketing team sending 12,000 monthly promotional emails can use this Skill to configure DMARC policy progression, fix SPF record lookup limits, and meet Google's bulk sender requirements to avoid junk folder placement and improve engagement rates.

Quick Start

Use the domain-authentication skill to configure SPF, DKIM, and DMARC records for your sending domain and verify all authentication checks pass for test emails.