Redmine

Hi Team

After I'v upgraded Redmine from 1.3.1 to 2.3.0 it stopped sending mail notifications.
The configuration file seems OK (didn't change) but I didn't see anything from the associated email mailbox in /var/log/mail.log.
Also there are no more 'Sending email notification to: ...' lines in Redmine's log.

MY Ruby Version is:
ruby 1.9.3p429 (2013-05-15 revision 40747) [x86_64-linux]

Rails version:
Rails 3.2.13

GeM
1.8.25

Here is my configuration.yml

email_delivery:
delivery_method: :smtp
smtp_settings:
tls: true
enable_starttls_auto: true
address: "email-smtp.us-east-1.amazonaws.com"
port: 587
domain: "example.com"
authentication: :plain
user_name: "AKIAJT2T5DPXVAQE55A"
password: "AiJxoNpgFjytdOyG4xlpsUy9uifxvy5BxwD2ErCWuz/H"

My Upgrade is stopped due to this issue.Please help me,its urgent

Thanks
Zam