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IMAP Sent folder fix, lower Transactional Send limits

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Fixed

Section titled “Fixed”
  • IMAP Sent folder detection now correctly finds Sent folders with non-ASCII names or without the special-use \Sent flag, so messages sent through IMAP grants are filed into the right folder instead of being missed by folder discovery.

Changed

Section titled “Changed”
  • Transactional Send rate limits have been lowered. If your integration sends at high volume through Transactional Send, check your request rate against the current limits in Rate limits to avoid unexpected 429 responses.