Recover Draft Emails from Deleted Account
The default Samsung mail app is com.samsung.android.email.provider.
Unfortunately backup is disabled for this app (the app's AndroidManifest.xml contains the entry android:allowBackup=&quot;false&quot;). Because of this you can't access the app's private data directory /data/data/com.samsung.android.email.provider on a non-rooted device.
As the mail storage database is placed inside this app-private data directory you can't extract the files for manually searching the data base e.g. using a hex editor or a different data recovery software.
As your device is pretty old (it is from 2014 and should be running Android 6?) any thus have not received Android security updates for years there may be the possibility to temporary root the device using an exploit. Unfortunately I don't know a reliable and trustworthy rooting app that would work on your device. Note that using such rooting apps may be dangerous as you never know what the app is actually doing in background.