Redmine Email Configuration – Resolve Sending Email Notifications

I upgraded my Redmine installation after a while to 2.3.1 and I noticed email notifications weren’t being sent out. I tried to send a test email from “Administration => Settings => Email notifications” and received the following error message:

An error occurred while sending mail (wrong argument (Fixnum)! (Expected kind of OpenSSL::SSL::SSLContext))

After trying different solutions for hours, I finally got it resolved by setting following in my configuration.yml:

production: 
  email_delivery: 
    delivery_method: :smtp
    smtp_settings: 
      address: mail.your-domain.com
      authentication: :login
      domain: your-domain.com
      enable_starttls_auto: false
      openssl_verify_mode: none
      password: password-without-quotes
      port: 25
      user_name: email-without-quotes

If you have copied your configuration.yml from sample file, make sure that you remove other production: from the end of file.

IMPORTANT: Also make sure that your file is a valid yml file. Otherwise Redmine will just stop working. You can validate your configuration.yml file from this web service. http://yamllint.com/ before uploading to the server.

Hope that helps!