Windows outlook 邮件列表Sender字段显示的误区

有些人的MUA显示类似如下的信息

From listname-admin@mailman.server.com 代表 fred@poster.domain.com

或者

From listname-bounces@mailman.server.com 代表 fred@poster.domain.com

原因在 http://wiki.list.org/display/DOC/From+field+displayed+by+Microsoft+Outlook 有说明，这是由于Windows下的一些MUA解释邮件头字段Sender造成的，相关的RFC说明

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The "Sender:" field specifies the mailbox of the agent responsible for the actual transmission of the message. For example, if a secretary were to send a message for another person, the mailbox of the secretary would appear in the "Sender:" field and the mailbox of the actual author would appear in the "From:" field. If the originator of the message can be indicated by a single mailbox and the author and transmitter are identical, the "Sender:" field SHOULD NOT be used. Otherwise, both fields SHOULD appear.
http://www.faqs.org/rfcs/rfc2822.html
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从这个说明看，Windows的MUA在显示Sender字段的准确性上有待商榷。