Redmine

hi,

I would like to configure RedMine to sent notifications via exchange server, but I'm not able to : ( [ it was ok when configured with gmail

when trying to 'send a test e-mail' [http://my_redmine_host_IP:3000/settings/edit?tab=notifications ] , following error:
An error occurred while sending mail (550 5.7.1 Client does not have permissions to send as this sender )


appears
------------------------
configuration:
Redmine 1.3.2.stable @ ubuntu server

exchange SMTP :

Server name: xxx.outlook.com
Port: 587
Encryption method: TLS
--------------------------

section of configuration.yml related to email account settings: ######################################################
default:
email_delivery:
delivery_method: :smtp
smtp_settings:
enable_starttls_auto: true
address: "xxxxxx.outlook.com"
domain: "outlook.com"
port: 587
authentication: :login
user_name: "karol.kanicki@xxxxx.com"
password: "xxxxxxxxxx"

------------------------------------------
anybody ?

thx in advance

regards