Actionmailer图像在开发中发送而不是分段或生产

Question

所以我遇到的问题是，从开发服务器发送的图像会显示在电子邮件中，但是在生产/暂存模式下发送时，图像不会显示在电子邮件中，但是在复制图像时来自电子邮件源的URL我可以在浏览器中显示图像。我有另一个应用程序与几乎相同的production.rb文件一起运行，它发送的图像没有问题，所以我不确定我错过了什么。

development.rb

Rails.application.configure do

  config.cache_classes = false
  config.eager_load = false
  config.consider_all_requests_local       = true
  config.action_controller.perform_caching = false

  config.action_mailer.raise_delivery_errors = true
  config.action_mailer.perform_deliveries = true

  host = 'development.local'
  config.action_mailer.default_url_options = { host: host, protocol: 'https' }
  config.action_mailer.delivery_method = :smtp
  config.action_mailer.asset_host = 'https://development.local'
  config.action_mailer.smtp_settings = {
    address:              "smtp.gmail.com",
    port:                 587,
    domain:               "gmail.com",
    user_name:            ENV["GMAIL_USER"],
    password:             ENV["GMAIL_PASS"],
    authentication:       :plain,
    enable_starttls_auto: true
  }

  config.active_support.deprecation = :log
  config.active_record.migration_error = :page_load
  config.assets.debug = true
  config.assets.digest = true
  config.assets.raise_runtime_errors = true
  config.web_console.whitelisted_ips = '172.17.0.0/16'
  config.web_console.whitelisted_ips = '0.0.0.0/0.0.0.0'
end

staging.rb / production.rb

Rails.application.configure do
  config.cache_classes = true
  config.eager_load = true
  config.consider_all_requests_local       = false
  config.action_controller.perform_caching = true

  config.serve_static_files = ENV['RAILS_SERVE_STATIC_FILES'].present?
  config.assets.js_compressor = :uglifier
  config.assets.compile = false
  config.assets.digest = true
  config.force_ssl = true

  config.log_level = :debug

  config.action_controller.asset_host = 'https://production.local'

  config.action_mailer.raise_delivery_errors = true
  config.action_mailer.perform_deliveries = true
  host = "production.local"
  config.action_mailer.asset_host = 'https://production.local'
  config.action_mailer.default_url_options = { host: host, protocol: 'https' }
  config.action_mailer.delivery_method = :smtp
  config.action_mailer.smtp_settings = {
    :address              => "smtp.gmail.com",
    :port                 => 587,
    :domain               => "gmail.com",
    :user_name            => ENV["GMAIL_USER"],
    :password             => ENV["GMAIL_PASS"],
    :authentication       => :plain,
    :enable_starttls_auto => true  
  }

  config.i18n.fallbacks = true
  config.active_support.deprecation = :notify
  config.log_formatter = ::Logger::Formatter.new
  config.active_record.dump_schema_after_migration = false
end

视图/ user_mailer文件/ account_activation.html.erb

<div style="overflow:hidden;max-width:600px;margin:auto;border-radius:7px;box-sizing:border-box;box-shadow:0 6px 12px rgba(0, 0, 0, 0.175);">
  <div style="overflow:hidden;background:#a1cbd6;color:#603914;padding:10px 20px;box-sizing: border-box;">
    <%= image_tag('logo_h.png', style: "float:left;") %> <h1 style="float:left;margin:15px 15px 5px;">Test Company</h1>
  </div>

  <div style="overflow:hidden;background:#fff;padding:25px;box-sizing: border-box;">
    <p>Hi <%= @user.name %>,</p>

    <p>This account allows you to access everything you need</p>

    <p>Activate your account by clicking the link below:</p>

    <%= link_to "Activate", edit_account_activation_url(@user.activation_token, email: @user.email) %>

  </div>
</div>