Command rake RAILS_ENV=production redmine:send_reminders days=7 doesn't send any emails to users.
Issue notification works fine

email config

production:
  email_delivery:
    delivery_method: :async_smtp
    async_smtp_settings:
      tls: false
      enable_starttls_auto: false
      address: "****"
      port: 25
      domain: "****"
      authentication: :login
      user_name: "****"
      password: "****"
      openssl_verify_mode: "none"

In application log i've only this:

Rendered mailer/reminder.text.erb within layouts/mailer (51.4ms)
Rendered mailer/reminder.html.erb within layouts/mailer (11.2ms)

"rake about" output

About your application's environment
Ruby version              1.9.2 (i486-linux)
RubyGems version          1.3.7
Rack version              1.4
Rails version             3.2.6
JavaScript Runtime        therubyracer (V8)
Active Record version     3.2.6
Action Pack version       3.2.6
Active Resource version   3.2.6
Action Mailer version     3.2.6
Active Support version    3.2.6
Middleware                Rack::Cache, ActionDispatch::Static, Rack::Lock, #, Rack::Runtime, Rack::MethodOverride, ActionDispatch::RequestId, Rails::Rack::Logger, ActionDispatch::ShowExceptions, ActionDispatch::DebugExceptions, ActionDispatch::RemoteIp, ActionDispatch::Callbacks, ActiveRecord::ConnectionAdapters::ConnectionManagement, ActiveRecord::QueryCache, ActionDispatch::Cookies, ActionDispatch::Session::CookieStore, ActionDispatch::Flash, RedmineDmsf::NoParse, ActionDispatch::ParamsParser, ActionDispatch::Head, Rack::ConditionalGet, Rack::ETag, ActionDispatch::BestStandardsSupport, OpenIdAuthentication
Application root          /var/www/redmine
Environment               production
Database adapter          mysql2
Database schema version   20120714122200