I had a little problem today with one of my managed sites, one that was using  ActionMailer for sending mails in a Contact Us form using GMail’s  SMTP.

But reading server logs wasn’t very enlightening.

$ tail log/production.log Completed 500 Internal Server Error in 533ms  Net::SMTPAuthenticationError (535-5.7.1 Please log in with your web browser and then try again. Learn more at  ): app/controllers/contact_controller.rb:11:in `create'

And that was all. That line of code was a simple…

NotificationsMailer.new_message(@message).deliver

…so I investigated a lot of workarounds, double-checked my configurations and everything seemed perfect.

But then it came to me. I logged to the account that was being used to send all the mails, and this was on the inbox.

  User,

Someone recently tried to use an application to sign in to your Google Account, our.sender.email@gmail.com. We prevented the sign-in attempt in case this was a hijacker trying to access your account. Please review the details of the sign-in attempt:

Sunday, July 29, 2012 6:55:17 PM  GMT

IP Address: 123.456.789.101

Location: Paris, France

If you do not recognize this sign-in attempt, someone else might be trying to access your account. You should sign in to your account and reset your password immediately. Find out how at http://support.google.com/accounts?p=reset_pw

If this was you, and you want to give this application access to your account, complete the troubleshooting steps listed at http://support.google.com/mail?p=client_login

Sincerely,

The Google Accounts Team

I investigated a bit and realized that my account wasn’t using 2-step verification.  So I configured the account with 2-step verification and created a specific password for my web app , changed it in my configuration and everything worked again flawlessly.

PD: If you are wondering what’s my configuration in config/application.rb, here it goes, in case it helps you.