[Mail] 如何在$HOME/.forward中调用一个应用程序？

[weixin_38051598]

如何在$HOME/.forward中调用一个应用程序？ 我想做一个在mail服务器收到邮件时就能运行一个程序。
我想把这个程序加在$HOME/.forward中，写法如下： lijunlin, "|/usr/bin/hello  lijunlin"   

测试时提示如下错误：
----- The following addresses had permanent fatal errors -----
"|/usr/bin/hello "
    (reason: Service unavailable)
    (expanded from: <[e-mail]>)

   ----- Transcript of session follows -----
smrsh: hello not available for sendmail programs
554 5.0.0 Service unavailable