Error with ActionMailer

I wrote my app in Rails 2.1 - emails seemed to work fine.
My host are running Rails 2.2.2 though and now I get this error
message when sending emails:

OpenSSL::SSL::SSLError (hostname was not match with the server

Can anyone advise?



These are my configuration settings in base.rb

    @@smtp_settings = {
      :address => "localhost",
      :port => 25,
      :domain => '',
      :user_name => '',
      :password => 'mypassword',
      :authentication => :login
    cattr_accessor :smtp_settings

Are these incorrect?