Mail message delete problem
On Sierra when I give a keyboard shortcut command to delete a message from the inbox its line gets greyed out but it does not delete. Alternatively, if I hit the keyboard delete key, which is the default key for the delete command, I get the message
'The message "test" could not be moved to the mailbox "Exchange" The specified object was not found in the store., The process failed to get the correct properties.'
If I quit and restart mail the offending message is gone from the Inbox into the trash.
I went into my ~/library folder and deleted com.apple.mail.plist and com.apple.mail-shared.plist. After a restart neither of these files was recreated by the Mail app and the behavior is the same.
Any suggestions how to fix things?
Thanks,