I've tried this from multiple email clients; iOS MailBox, GMail and Lotus Notes. I'm using Windows and Mac (though yesterday my testing was through the Windows client). The email subjects I used yesterday for testing were nothing more than "Test Email", "Another Test Email" - the notebooks that the emails ended up in were nothing like the text in the subject.
When emailing into Evernote I don't seem to get a consistent notebook selected. I know I can specify a notebook in the subject line but when I don't use that feature I want all emails to go to the default notebook as specified in the client. I have sent several emails from two different accounts and on each occasion the emails were filed in different notebooks. I can't seem to see any setting to change this. Thanks