Skill: email-server-diagnostics
Author: arova-ai
Description: Diagnose and analyze self-hosted email server configurations. Checks DNS records (MX, SPF, DKIM, DMARC, MTA-STS, TLSRPT, rDNS, autodiscover, BIMI, DANE/TLSA), TLS certificates (HTTPS, IMAPS, SMTPS, protocol versions), port connectivity, IP/domain blacklist status, SPF lookup limits, open relay, IPv6 consistency, and server internals (Postfix, Dovecot, mailboxes, DKIM keys, mail queue). Also validates against Google/Yahoo/Microsoft 2024-2025 bulk sender requirements. Use this skill whenever the user mentions email server health checks, mail deliverability issues, DNS configuration for email, email authentication setup (SPF/DKIM/DMARC), mail server migration, diagnosing why emails go to spam or get rejected, or checking compliance with Gmail/Outlook sender policies. Also trigger when the user asks to set up or verify a mail domain, check email security, audit an existing mail server (mailcow, iRedMail, Postfix, etc.), or investigate email bounces.