外贸邮件群发Skill

Enterprise email mass-sending system for sales outreach campaigns. Handles the full pipeline: reading client HTML reports to extract contacts, building industry-differentiated email templates, Excel contact import, personalized variable substitution, HTML email with inline CSS and plain-text fallback, SMTP sending with rate limiting, RFC 5322 compliance, IMAP Sent folder auto-sync, and BCC-free verification. Should be used when the user wants to send marketing or outreach emails to multiple contacts, mentions "群发", "邮件群发", "email campaign", "开发信群发", or provides a client report HTML and asks to send emails to those clients.

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