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Vladimir Panteleev
Asked: 2013-09-27 13:30:33 +0800 CST

How do I filter a message's content through a program, then forward it to another address?

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In qmail, you could put this in a .forward file:

|/usr/local/bin/myfilter | forward [email protected]

This would pipe the whole message, incl. headers, to the myfilter program, then forward the message printed to its standard output to [email protected].

However, Exim doesn't have a forward program, and generally ignores the output of pipe transports.

How can one do this with Exim .forward files?

exim

1 Answers

  1. Best Answer

    Pipe the program output through sendmail. Exim installs its own implementation of the program.

    |sh -c '/usr/local/bin/myfilter | /usr/sbin/sendmail -i [email protected]'

    Notes:

    • You have to use sh - Exim will execute the indicated program directly, rather than through a shell like qmail. A shell is needed to parse the | operator.
    • Specify the full path to sendmail, as /usr/sbin/ likely won't be in the PATH of the user that Exim will be running under while processing the .forward file.
    • Don't use the -t sendmail flag.
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