Redmine

After switching from smtp to asynch_smtp notification does not work at all.

If I use "Send a test email" I get the following error message:

An error occurred while sending mail (undefined method `new' for "async_smtp":String)

If I edit an issue with watchers, no mails are delivered. In the production.log there is an entry:

NoMethodError (undefined method `new' for "async_smtp":String):
  app/models/mailer.rb:410:in `mail'
  app/models/mailer.rb:42:in `issue_add'
  app/models/mailer.rb:423:in `initialize'
  app/models/mailer.rb:446:in `method_missing'
  app/models/mailer.rb:52:in `block in deliver_issue_add'
  app/models/issue.rb:831:in `each_notification'
  app/models/mailer.rb:51:in `deliver_issue_add'
  app/models/issue.rb:1528:in `send_notification'
  app/models/issue.rb:165:in `create_or_update'
  app/controllers/issues_controller.rb:150:in `create'

Does anyone using async_smpt out there without problems?

Yesterday I fought with async_smtp problems and database authentification, see #18647 - this I could fix, but I am wondering, if I am the only one.

My configuration:

default:
  delivery_method: :async_smtp
  async_smtp_settings:
     address: "smtp.my-server.com" 
     port: 25

My system:

Environment:
  Redmine version                2.5.3.stable
  Ruby version                   2.0.0-p576 (2014-09-19) [x86_64-linux]
  Rails version                  3.2.19
  Environment                    production
  Database adapter               Mysql2