Obviously, MUAs (mail user agents), filters, or MTAs (mail transport agents) should do this work rather than requiring users to do it manually.
显然，应该由MUA(邮件用户代理，mail user agents)、过滤器或者MTA(邮件传输代理，mail transport agents)来做这件事情，而不是要求用户手工完成。
Obviously, MUAs (mail user agents), filters, or MTAs (mail transport agents) should do this work rather than requiring users to do it manually.
显然，应该由MUA(邮件用户代理，mail user agents)、过滤器或者MTA(邮件传输代理，mail transport agents)来做这件事情，而不是要求用户手工完成。
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