help me troubleshoot K-9 mail or suggest other mail apps (stand-alone)

My phone is a Nexus 5 with android 6.0.1 (M4B30X) all stock untouched (rooted).

I removed the apps I don't need (battery increased to 3 days), this has caused some apps to crash, a total of (4) apps crashed out of (53) total, I could do without some, but it seems I cannot find a mail app, I liked K-9 but unfortunately it crashes without saying why?

As I am a windows user, I am struggling to investigate android stuff, .. if any experts here could give me some ideas, I would be most grateful, ..

I also tried: Email_3.0.0.39_160613.apk, BlueMail_1.9.2.11.apk, FastMail_1.05.06.apk, K-at_Mail_Pro_1.14.apk, K-9_Mail_5.010.apk, K-9_Mail_5.114.apk. Some of them launch, download emails but crash once trying to open an email item.

K-9 which I like, it crashes at launch.
I am suspecting dependencies on the apps removed below:

Here is my list of Removed/Kept Apps:

--KEPT--/system/priv-app/TeleService
--KEPT--/system/priv-app/TelephonyProvider
--KEPT--/system/priv-app/Telecom
--KEPT--/system/priv-app/SystemUI
--KEPT--/system/priv-app/StatementService
--KEPT--/system/priv-app/Shell
--KEPT--/system/priv-app/SettingsProvider
--KEPT--/system/priv-app/Settings
--KEPT--/system/priv-app/GooglePackageInstaller
--KEPT--/system/priv-app/GoogleDialer
--KEPT--/system/priv-app/GoogleContacts
--KEPT--/system/priv-app/ExternalStorageProvider
--KEPT--/system/priv-app/DefaultContainerService
--KEPT--/system/priv-app/ContactsProvider
--KEPT--/system/priv-app/CalendarProvider
--KEPT--/system/app/Stk
--KEPT--/system/app/PacProcessor
--KEPT--/system/app/CertInstaller
--KEPT--/system/app/BluetoothMidiService
--KEPT--/system/app/Bluetooth
--REMOVED--/system/priv-app/WallpaperCropper
--REMOVED--/system/priv-app/VpnDialogs
--REMOVED--/system/priv-app/Velvet
--REMOVED--/system/priv-app/TagGoogle
--REMOVED--/system/priv-app/SprintHiddenMenu
--REMOVED--/system/priv-app/SharedStorageBackup
--REMOVED--/system/priv-app/SetupWizard
--REMOVED--/system/priv-app/ProxyHandler
--REMOVED--/system/priv-app/PrebuiltGmsCore
--REMOVED--/system/priv-app/Phonesky
--REMOVED--/system/priv-app/OmaDmclient
--REMOVED--/system/priv-app/MusicFX
--REMOVED--/system/priv-app/MmsService
--REMOVED--/system/priv-app/MediaProvider
--REMOVED--/system/priv-app/ManagedProvisioning
--REMOVED--/system/priv-app/Launcher2
--REMOVED--/system/priv-app/InputDevices
--REMOVED--/system/priv-app/GoogleServicesFramework
--REMOVED--/system/priv-app/GooglePartnerSetup
--REMOVED--/system/priv-app/GoogleOneTimeInitializer
--REMOVED--/system/priv-app/GoogleLoginService
--REMOVED--/system/priv-app/GoogleFeedback
--REMOVED--/system/priv-app/GoogleBackupTransport
--REMOVED--/system/priv-app/GCS
--REMOVED--/system/priv-app/FusedLocation
--REMOVED--/system/priv-app/DownloadProvider
--REMOVED--/system/priv-app/ConfigUpdater
--REMOVED--/system/priv-app/CellBroadcastReceiver
--REMOVED--/system/priv-app/CarrierConfig
--REMOVED--/system/priv-app/CallLogBackup
--REMOVED--/system/priv-app/BackupRestoreConfirmation
--REMOVED--/system/app/YouTube
--REMOVED--/system/app/WebViewGoogle
--REMOVED--/system/app/Wallet
--REMOVED--/system/app/Videos
--REMOVED--/system/app/UserDictionaryProvider
--REMOVED--/system/app/UpdateSetting
--REMOVED--/system/app/TimeService
--REMOVED--/system/app/talkback
--REMOVED--/system/app/SunBeam
--REMOVED--/system/app/shutdownlistener
--REMOVED--/system/app/qcrilmsgtunnel
--REMOVED--/system/app/PrintSpooler
--REMOVED--/system/app/PrebuiltNewsWeather
--REMOVED--/system/app/PrebuiltKeepStub
--REMOVED--/system/app/PrebuiltGmail
--REMOVED--/system/app/PrebuiltExchange3Google
--REMOVED--/system/app/PrebuiltDeskClockGoogle
--REMOVED--/system/app/PrebuiltBugleStub
--REMOVED--/system/app/PlusOne
--REMOVED--/system/app/PlayGames
--REMOVED--/system/app/Photos
--REMOVED--/system/app/PartnerBookmarksProvider
--REMOVED--/system/app/NfcNci
--REMOVED--/system/app/NewsstandStub
--REMOVED--/system/app/Music2
--REMOVED--/system/app/MediaShortcuts
--REMOVED--/system/app/Maps
--REMOVED--/system/app/LiveWallpapersPicker
--REMOVED--/system/app/LatinImeGoogle
--REMOVED--/system/app/KoreanIME
--REMOVED--/system/app/KeyChain
--REMOVED--/system/app/iWnnIME
--REMOVED--/system/app/HTMLViewer
--REMOVED--/system/app/Hangouts
--REMOVED--/system/app/GoogleTTS
--REMOVED--/system/app/GooglePinyinIME
--REMOVED--/system/app/GoogleHome
--REMOVED--/system/app/GoogleHindiIME
--REMOVED--/system/app/GoogleEars
--REMOVED--/system/app/GoogleContactsSyncAdapter
--REMOVED--/system/app/GoogleCamera
--REMOVED--/system/app/FitnessPrebuilt
--REMOVED--/system/app/FaceLock
--REMOVED--/system/app/EditorsSlidesStub
--REMOVED--/system/app/EditorsSheetsStub
--REMOVED--/system/app/EditorsDocsStub
--REMOVED--/system/app/Drive
--REMOVED--/system/app/DownloadProviderUi
--REMOVED--/system/app/DocumentsUI
--REMOVED--/system/app/DMAgent
--REMOVED--/system/app/CloudPrint2
--REMOVED--/system/app/Chrome
--REMOVED--/system/app/CaptivePortalLogin
--REMOVED--/system/app/CalendarGooglePrebuilt
--REMOVED--/system/app/CalculatorGoogle
--REMOVED--/system/app/Books
--REMOVED--/system/app/BasicDreams

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