Redmine

If your mail settings where set on :async_smtp or :async_sendmail, please rename your smtp_settings section name to async_smtp_settings or sendmail_settings to async_sendmail_settings (see #11376#note-10).

Else, have a look to your production.log contents.

Good Night, After change smtp_settings to async_smtp_settings, i don't receive any email from Redmine, no work yet.
...??

Log before save user,

>"asc", "warn_on_leaving_unsaved"=>"1"}, "send_information"=>"1", "commit"=>"Salvar", "id"=>"3"}
  Current user: vauruk (id=3)
  Rendered mailer/account_information.text.erb within layouts/mailer (1.0ms)
  Rendered mailer/account_information.html.erb within layouts/mailer (0.0ms)
Redirected to http://localhost:3000/users/3/edit
Completed 302 Found in 440ms (ActiveRecord: 15.0ms)

configuration.yml this:
I tried so

production:
email_delivery:
delivery_method: :smtp
smtp_settings:
address: host_email
port: 25
domain: company
authentication: :none

default:
email_delivery:
delivery_method: :async_smtp
async_smtp_settings:
address: host_email
port: 25
domain: mycompany
authentication: :login

Not sure if this helps. I upgraded from 1.1.1 to 2.1.2 and email notifications stopped... until I went to settings and did a test message. From there on it seem to work fine. Maybe it was just coincidence.