Auto-Categorization of Emails?

Is there a way to disable the auto-categorizing feature of eM mail? I connect to my IMAP server and almost all of the emails in any box I open receive a “not junk” category. I would rather manually assign the categories instead of having it ‘detect’ them on load. Is there a way to do this?

what IMAP server do you use?

I’m using Dovecot, do you think that would have an effect?