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:authentication => One of :plain, :login, or :cram_md5. Your server administrator will help choose the right option. There is currently no way of using TLS (SSL) to connect to a mail server from Rails. This parameter should be omitted if your server does not require authentication. If you do omit this param- eter, also omit (or comment out) the :user_name and :password options.
From the Design Piracy series on my blog: