How to route inbound emails into Slack threads without duplicates or data loss

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A developer tutorial on DEV Community details how to build an email-to-Slack integration using a Cloudflare Worker and the MailKite library. The guide addresses the core structural mismatch between email's MIME/Message-ID format and Slack's block-based messaging system, which has a 50-block limit per message. Key challenges covered include preserving reply threading, surfacing email authentication results such as SPF, DKIM, and DMARC, and handling attachments without losing data. The tutorial also tackles the duplicate-post problem by using a KV store as an idempotency layer, keyed on each email's unique ID. Code is provided for the full inbound half of the integration, running as a Cloudflare Worker with webhook signature verification and retry-safe message delivery.

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ProgrammingDEV Community ·

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