REDMINE on Debian 7 doesn't send mails over Exchange

Question

i'm running Redmine on Debian 7 and try to send mails via Mircosoft Exchange.

My configuration.yml looks like:

default:
email_delivery:
delivery_method: :smtp
smtp_settings:
enable_starttls_auto: true
      address: <FIREWALLIP or SMTPIP>
      port: 25
      domain: <MYDOMAIN.local or mydomain.de>
      authentication: :login
      user_name: "username"
      password: "pwd"

I used both the Firewall and smtp ips and various combinations of domains and usernames to try it.

Sending the mail via telnet works with both ips.

Can anyone help?

Thanks.

edit resolved:

works with this configuration:

    default:
    email_delivery:
    delivery_method: :smtp
    smtp_settings:
      address: <FIREWALLIP>
      port: 25
      domain: <mydomain.de>

Answer 1

works with this configuration:

default:
email_delivery:
delivery_method: :smtp
smtp_settings:
  address: <FIREWALLIP>
  port: 25
  domain: <MYDOMAIN.local or mydomain.de>
  authentication: :login
  user_name: "username"
  password: "pwd"