Redmine

Hello

I'm about to make a new installation of redmine. But always, when I will activate the SMTP-Server-Config in configuration.yml crashes the system.
In the logfile I have the following message:

undefined method `email_delivery=' for ActionMailer::Base:Class (NoMethodError)
  /usr/share/rubygems-integration/all/gems/actionmailer-5.2.3/lib/action_mailer/base.rb:582:in `method_missing'

Does anyone have an idea what the problem is. I have already re-installed the server 3 times.
Attached you will find the passenger_log.

Thank you all.

Regard
Philipp