If that's the case, attorney-client privilege doesn't apply.
According to all that is publicly known, Trump does not use email, personally. Others may read out the contents to him, or print out the messages. But he doesn't email.
https://twitter.com/jimsciutto/status/984866543740825601 https://twitter.com/jimsciutto/status/984866002797236224 https://twitter.com/jimsciutto/status/984860858177216512 https://twitter.com/NatashaBertrand/status/984867684448980995 https://twitter.com/ambiej/status/984867691054944256 https://twitter.com/joe_in_nyc/status/984867508460163072 https://twitter.com/normative/status/984867429909135361 https://twitter.com/yashar/status/984867269992960001