Set transfer encoding in stock email app

I use Android's stock email client "com.android.email" version 8.1.0 on Samsung Galaxy J5 running LineageOS. I noticed that the emails are sent using Content-Transfer-Encoding: base64 I'd like to change this to something like Content-Transfer-Encoding: 7bit Going through the email client's options, I couldn't find anything relevant. Is there still a way to change the transfer encoding for the email body?