16.6 为什么我发给任何在FreeBSD.com地址的任何…

16.6 为什么我发给任何在FreeBSD.com地址的任何邮件都被退回了？
FreeBSD.org的邮件系统对所有进入的邮件执行严格的前缀检查，退回那些设定不恰当或者可能被是圾邮件的邮件。你的邮件可能因下列的某一个原因而被退回：
1、你的邮件是通过一个垃圾邮件的域名或IP块发出的
FreeBSd邮件系统服务器退回从已知垃圾邮件系统发出的邮件。如果你的邮件服务是来至一个产生或转接垃圾邮件的公司或域名，请换一个不提供这些服务的邮件服务提供商。
2、邮件的主题部分只包含HTML.
邮件只应该以纯文本的方式发送，请设置你的邮件代理发送纯文本。
3、FreeBSD.org的mailer 不能将连接到主机ip地址解释成符号名。
从邮件服务器接收邮件能运行反向的DNS是一个标准要求。请为你的邮件服务器的IP地址设置反向DNS。许多家庭网络服务(DSL, cable, dialup等等)一般不提供这些功能。在这种情况下，请通过你的邮件服务提供商转发你的邮件.
4、由EHLO/HELO (SMTP exchange的一部分)给出的主机名不能解析成IP地址
在邮件被接受前，在SMTP的对话中一个完全合格的，能够解析的主机名式非常必要的。如果你没有在DNS中登记的主机名，你应该用你的邮件服务提供商的邮件服务器来转发你的邮件。
5、你信息中由一个信息ID以localhost字符串结尾
有些邮件用户代理生成一些不能别接受的不合格的信息ID。你需要说服你的邮件用户代理生成合法的ID或者设置你的邮件传递代理重写这些信息。
PS 原文

16.6. Why does my email to any address at FreeBSD.org bounce?
The FreeBSD.org mail system implements some of the stricter Postfix checks on incoming mail and rejects mail that is either misconfigured or is potential spam. Your mail might bounce for one of the following reasons:

• 
  The email is being sent from a known spam domain or IP block.
  The FreeBSD mail servers reject email from known spam sources. If you have service through a company or domain who generates or relays spam, please switch to a service provider who does not.
  
• 
  The body of the email only contains HTML.
  Mail should be sent in plain text only. Please configure your mail user agent to send plain text.
  
• 
  The mailer at FreeBSD.org cannot resolve the IP address of the connecting host back to a symbolic name.
  Working reverse DNS is a standard requirement for accepting mail from a host. Set up reverse DNS for your mail server's IP address. Many home services (DSL, cable, dialup, etc.) will not give you this option. In this case, relay your email through your service provider's mail server.
  
• 
  The hostname given in the EHLO/HELO part of the SMTP exchange cannot be resolved to an IP address.
  A fully qualified, resolvable host name is necessary in this part of the SMTP dialogue before mail will be accepted. If you do not have a host name that is registered in the DNS, then you should use your service provider's mail server to relay your mail.
  
• 
  Your message had a message ID ending with the string “localhost”.
  Some mail user agents generate bad message IDs which will not be accepted. You will need to persuade your mail user agent to generate a valid message ID or else configure your mail transfer agent to rewrite them.

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