The chat widget — Leaving an address, and ending the chat

A visitor can leave an email address mid-conversation so a reply still reaches them after the tab is closed. It is strictly a delivery target: it never resumes a conversation, because type an address to pick up where you left off is an account-takeover primitive dressed as a convenience. End conversation retires their credential immediately — the point of which is a shared machine — and can email them the transcript first. The transcript contains exactly the messages they could already read, and nothing else. The ticket and everything said on it stays with your team; the team's record of a conversation is not the visitor's to delete.