After migrating to Exchange Online, an existing business application still required a Fetchmail-compatible interface and could not be modified.
I built a Go-based drop-in replacement for Fetchmail with OAuth2 and Graph API integration. The tool reproduces expected Fetchmail behavior, adds robust retry and logging, and implements secure token/TLS handling.
The solution kept the commercial legacy software running unchanged and established a stable bridge to modern cloud mail infrastructure.
With lean, custom tools I close integration gaps in critical production environments - reliable, robust, and maintainable.
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