Redmine

Hi! I've been having problems with the Email Notification of the Redmine that I installed on an Ubuntu server. I installed a 2.6.0 version of it and when I was trying to configure the email notifications, at redmine/config/configuration.yml, I wasn't getting any email whenever I'm testing it. Is there any way you could help me with my problem?

Here is the current config of my configuration.yml:

1. Outgoing email settings

production:
email_delivery:
delivery_method: :sendmail
smtp_settings:
address: localhost
port: 25
domain: example.net
authentication: :login
user_name: "redmine@example.net"
password: "redmine"

development:
email_delivery:
delivery_method: :sendmail
smtp_settings:
address: 127.0.0.1
port: 25
domain: example.net
authentication: :login
user_name: "redmine@example.net"
password: "redmine"

Great help is well appreciated! Thank you..