assuming all emails sent to the clearnet from a specific email provider are tracked by country e.g. all emails from protonmail will have a link to switzerland and the NSA AI will scan and read them cause they are in the clearnet. If protonmail uses a .onion address, does the email exit protonmail servers into the clearnet through a tor exit node? Can the NSA AI track it?

If an email provider uses an .onion address, does the email exit their servers into the internet through a tor exit node? Could a powerful adversary track it?