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Send reliability, IMAP filtering, and Scheduler fixes

EmailScheduler

Fixed

Section titled “Fixed”
  • An Idempotency-Key could stay in the in_progress state if the client disconnected mid-request, which permanently blocked retries that reused that key. Sends now clear the key correctly after a disconnect.
  • SMTP sends could stall past the SDK’s request timeout because of an incorrect port fallback during STARTTLS negotiation. The fallback now uses the correct port under a bounded dial timeout.
  • Creating a draft with attachments (multipart) now returns the metadata you set on the draft in the response. It was previously omitted.
  • Sending through Microsoft Graph now retries transient provider failures on the send and draft-send paths instead of immediately returning an error.
  • Workflow-triggered sends that hit a rate limit are now retried automatically instead of failing outright.
  • thread_id filtering on GET /v3/grants/{grant_id}/messages no longer double URL-decodes the query parameter on IMAP grants. Thread IDs containing characters that need decoding could previously fail to match any messages.
  • has_attachment=false on GET /v3/grants/{grant_id}/threads now correctly excludes threads that have attachments on IMAP grants, instead of sometimes still returning them.
  • min_booking_notice set on a Scheduler Configuration is now applied when Nylas computes slots for POST /v3/calendars/availability. Previously, availability could return slots that fell inside the configured notice window.