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Googleで2段階認証を使っているときにRailsのActionMailerでGmailを使う方法

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問題

RailsでActionMailerを使って、Gmailでメールを送信しようとすると、
Application-specific password required
なるエラーが発生しました。

調べたところ、
Stackoverflowでも同様の質問がありました。
http://stackoverflow.com/questions/11007061/error-when-sending-email-confirmation-using-actionmailer-on-ror

解決方法

/config/environments/development.rb
  config.action_mailer.smtp_settings = {
    address: "smtp.gmail.com",
    port: 587,
    domain: "gmail.com",
    authentication: "plain",
    enable_starttls_auto: true,
    user_name: ENV["GMAIL_USERNAME"],
    # 消す password: ENV["GMAIL_PASSWORD"],
    password: "ここに、アプリケーション固有のパスワードを入れる"
  }

というように、アプリケーション固有のパスワードを設定すれば、問題なくメール送信できました。通常のログインに使うパスワードは不要です。

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