Redmine

RAILS_ENV=production script/about
/home/ootbdv/.gems/gems/coderay-1.0.9/lib/coderay/helpers/file_type.rb:19: warning: already initialized constant UnknownFileType
/home/ootbdv/.gems/gems/coderay-1.0.9/lib/coderay/helpers/file_type.rb:126: warning: already initialized constant TypeFromExt
/home/ootbdv/.gems/gems/coderay-1.0.9/lib/coderay/helpers/file_type.rb:132: warning: already initialized constant TypeFromShebang
/home/ootbdv/.gems/gems/coderay-1.0.9/lib/coderay/helpers/file_type.rb:138: warning: already initialized constant TypeFromName

Environment:
  Redmine version                          2.3.0.stable.11680
  Ruby version                             1.8.7 (x86_64-linux)
  Rails version                            3.2.13
  Environment                              production
  Database adapter                         MySQL
Redmine plugins:
  no plugin installed

(I don't know why I'm getting those warnings. If anyone knows how to get rid of them, please let me know.)

I'm trying to figure out why my Redmine install isn't sending out email. My configuration.yml file is configured as so:

production:
  email_delivery:
    delivery_method: :sendmail

I've also tried configuring for SMTP with the same non-results:

 production:
   email_delivery:
     delivery_method: :smtp
     smtp_settings:
       enable_starttls_auto: true
       address: "smtp.gmail.com" 
       port: 587
       domain: "smtp.gmail.com" 
       authentication: :plain
       user_name: "xxxxxxxx@gmail.com" 
       password: "xxx" 

I don't know how to troubleshoot this. Is there a log that errors are written to? I've already checked the production.log but it didn't have any helpful hints. Thanks for your help.