Redmine

  Environment:
  Redmine version                3.1.0.stable
  Ruby version                   2.0.0-p645 (2015-04-13) [i386-mingw32]
  Rails version                  4.2.3
  Environment                    production
  Database adapter               SQLServer

1. I replied to email notification from Redmine about the issue (with "RE: [test - Work #1198] in subject):

Issue #1198 has been reported by Ryabinovskiy Alexander.

Work #1198: test issue from email
•    Author: Ryabinovskiy Alexander
•    Status: New
•    Priority: Low
•    Assignee: Developer2
•    Category: 
•    Target version:

Project: test2 
Test issue description

2. I ran command on server:

rake redmine:email:receive_pop3 unknown_user=accept host=comp.local port=110 username=redmine@comp.local password=XXX allow_override=project,tracker,priority project=test

3. Issue #1198 was updated: Status, Priority, Target version, Assignee was changed, and Project did not. But I used only allow_override=project,tracker,priority option!