Redmine

Hi,

I recently upgraded from 1.4.x to 2.0.1. I am using a GMail account for my outgoing notifications. This used to work under 1.4.x but as soon as I upgraded to 2.0.1 it stopped working. When I try to send a test email I get the following error:

An error occurred while sending mail (A sender (Return-Path, Sender or From) required to send a message)

I checked the log files but I didn't find anything useful. What is the best way I can go about troubleshooting this? Any ideas?

The server is running MacOS X 10.6.

Environment:
  Redmine version                          2.0.1.stable.9768
  Ruby version                             1.9.3 (x86_64-darwin10)
  Rails version                            3.2.5
  Environment                              production
  Database adapter                         Mysql2
Redmine plugins:
  no plugin installed

Gems included by the bundle:
  * actionmailer (3.2.5)
  * actionpack (3.2.5)
  * activemodel (3.2.5)
  * activerecord (3.2.5)
  * activeresource (3.2.5)
  * activesupport (3.2.5)
  * arel (3.0.2)
  * builder (3.0.0)
  * bundler (1.1.3)
  * coderay (1.0.6)
  * erubis (2.7.0)
  * hike (1.2.1)
  * i18n (0.6.0)
  * journey (1.0.3)
  * json (1.7.3)
  * mail (2.4.4)
  * mime-types (1.18)
  * multi_json (1.3.6)
  * mysql2 (0.3.11)
  * net-ldap (0.3.1)
  * pg (0.13.2)
  * polyglot (0.3.3)
  * prototype-rails (3.2.1)
  * rack (1.4.1)
  * rack-cache (1.2)
  * rack-openid (1.3.1)
  * rack-ssl (1.3.2)
  * rack-test (0.6.1)
  * rails (3.2.5)
  * railties (3.2.5)
  * rake (0.9.2.2)
  * rdoc (3.12)
  * rmagick (2.13.1)
  * ruby-openid (2.1.8)
  * sprockets (2.1.3)
  * sqlite3 (1.3.6)
  * thor (0.15.2)
  * tilt (1.3.3)
  * treetop (1.4.10)
  * tzinfo (0.3.33)