You, and your assistant working on your behalf. Your synced mail lives in your own isolated vault, and excerpts are passed to AI model providers only to generate the responses you asked for.
Humans at otageLabs do not read your mail in the ordinary course of business. The exceptions are the standard, narrow ones: you explicitly ask us to look at something (support), a security investigation requires it, or the law compels it. The Privacy Policy spells this out.