Redmine

I've enabled IMAP on my outlook account. However, after setting everything up, I still get the following error: "Error: Command received in Invalid state".

My configuration.yml file looks like this:

default:
  # Outgoing emails configuration
  # See the examples below and the Rails guide for more configuration options:
  # http://guides.rubyonrails.org/action_mailer_basics.html#action-mailer-configuration
  email_delivery:
    delivery_method: :smtp
    smtp_settings:
      enable_starttls_auto: true
      address: "smtp.office365.com" 
      port: 587
      domain: "<my_domain>.com" 
      authentication: :login
      user_name: "<user_email>" 
      password: "<password>" 

The plugin "Helpdesk" presents a similar setup for email, offering a POP or IMAP option. I selected IMAP, filled in the options, but no luck.

It's extremely disappointing to purchase 2 plugins and find this common email platform is seemingly unsupported. Any tips? Was anyone able to coerce Redmine into using Outlook email?