I have a contact page form that is setup to send an email to a Gmail account. Only problem is it won't send. I believe I have narrowed the error down to my settings inside of the initializers directory.
These are my current settings for trying to setup a standard gmail account to send mail:
Could it be that my domain setting is wrong or should I be typing in myemail@gmail.com for :user_name? This is the first time I have used ActionMailer so I don't really know what I am doing. Can somebody please help me out!? Thanks!
If you are using the development environment, change the development.rb to raise delivery errors, with config.action_mailer.raise_delivery_errors = true
Also, the problem might be that :user_name should be the entire email address (myemail@gmail.com), that's how Gmail authenticates users.
domain does not necessarily have to be "gmail.com". You can put your own domain here is you wish.
You also need to specify :from. I found that if you deliver your email with .deliver you do not get an exception for the errors. Try .deliver! instead. With .deliver! you get details about what is wrong.
来源：https://stackoverflow.com/questions/4929680/setting-up-a-gmail-account-to-work-with-actionmailer-in-rails-3