Rails中Action Mailer结合Gmail无法自动发送邮件问题

我用Rails和Action Mailer开发表单功能，流程是访客提交表单后，数据存入数据库，自动给访客选择的俱乐部邮箱发送包含表单数据的邮件，最后跳转页面显示成功提示。目前除邮件发送外，其余功能均正常，卡了好几天找不到问题所在。我使用的是开启了双重认证的Gmail账号发送邮件，相关代码如下：

开发环境配置代码 #

# Configurations pour l'environnement de développement
config.action_mailer.delivery_method = :smtp
config.action_mailer.smtp_settings = {
  address: 'smtp.gmail.com',
  port: 587,
  domain: 'gmail.com',
  user_name: 'myemail@gmail.com',
  password: 'abcdefghijk',
  authentication: 'plain',
  enable_starttls: true,
  open_timeout: 5,
  read_timeout: 5
}

Trials控制器create方法代码 #

def create
  @trial = Trial.new(trial_params)
  club_name = params[:trial][:club]
  club = Club.find_by(name: club_name)

  if club
    @trial.club_id = club.id
    if @trial.save
      ClubMailer.rendezvous_email(@trial, club).deliver_now
      flash[:notice] = "Your message was successfully sent! 👍 You will be contacted soon by the club."
      redirect_to root_path
    else
      flash.now[:danger] = "An error occurred. Please try again."
      render :new
    end
  else
    flash.now[:danger] = "Club not found."
    render :new
  end
end

ClubMailer代码 #

class ClubMailer < ApplicationMailer
  def rendezvous_email(trial, club)
    @trial = trial
    @club = club
    begin
      mail(to: @club.email, subject: "Free trial in #{club.name} club! 🎉")
    rescue => e
      Rails.logger.error "Error sending email: #{e.message}"
      raise e
    end
  end
end

内容的提问来源于stack exchange，提问作者Laure Dev