Redmine

When attempting to retrieve email via POP3, I came across an error Net::POPAuthenticationError: -ERR Command is not valid in this state.

The command I used was:
rake redmine:email:receive_pop3 RAILS_ENV="production" host=exch.abc.local username=redmine@abc.local password=password123

I haved tried many different variations but after looking at the Ruby on Rails documentation, the host was replaced with address then my error no longer appear:
rake redmine:email:receive_pop3 RAILS_ENV="production" address=exch.abc.local username=redmine@abc.local password=password123