爲什麼ActionMailer（rails 2.3.5）會間歇性地發送text/html郵件？

我有一個Ruby on Rails應用程序運行rails v2.3.5，它已經發送了很長一段時間的text/html郵件。最近我們注意到有些收件人收到的電子郵件是HTML代碼而不是HTML/ERB模板。儘管這並不是全面的，並且通常同一個電子郵件客戶端將同時接收HTML和HTML作爲文本，所以我不認爲它是客戶端電子郵件程序。爲什麼ActionMailer（rails 2.3.5）會間歇性地發送text/html郵件？

下面是一個擴展了ActionMailer :: Base的Notifier.rb的代碼片段。這一行動使customer_order_notification.text.html.erb

def customer_order_notification(order) 
    subject  "Thanks for your order!" 
    body   :order => order 
    recipients  RAILS_ENV == 'development' ? APP_CONFIG['dev_email'] : order.email 
    bcc   RAILS_ENV == 'production' ? APP_CONFIG['supervisor_email'] : nil 
    from   'MyWebsite <[email protected]>' 
    sent_on  Time.now 
    content_type = "text/html" 
    headers  = {} 
end #end method customer_order_notification

服務器運行電子郵件軟件和配置的ActionMailer後綴低於：

ActionMailer::Base.delivery_method = :smtp 
ActionMailer::Base.smtp_settings = { 
    :address => '127.0.0.1', 
    :port => 25, 
    :domain => 'localhost' 
}

來源

2011-02-02 bwizzy

也許某些客戶端的郵件客戶端只設置爲文本？ – 2011-02-02 13:49:55