向各位大虾求救！

各位大虾，小弟是个新手！请教一个问题，如何在linux的邮件服务器上
设置过滤功能？因为最近公司网络上正在发作病毒，通过邮件传播！它的
主题和附件都不固定，但是邮件内容固定:Hi!How are you?I send you this file in order to have your advice or I hope you can help me with this file that I send or I hope you like the file that I send you or This is the file with the information that you ask for See you later.Thanks.  请大虾帮忙！小弟不胜感激！！！