varad gupta:
> >>> Kindly advise how to replace "text1" with "text2" for multiple
> >>> occurences of "text1" in the same line
> 
> Can you suggest any way in which my requirement can be achieved (apart
> from writing my own filter?)

Like this:

    /etc/postfix/main.cf:
         header_checks = tcp:127.0.0.1:port

or:

    /etc/postfix/main.cf:
         header_checks = socketmap:inet:127.0.0.1:port:mapname

Where a program listens on the specified port that implements the
Postfix tcp_table protocol (see "man tcp_table") or the Sendmail
socketmap protocol (ask your favorite search engine).

Socketmap support is introduced with Postfix 2.10.

    socketmap (read-only)
        Query a Sendmail-style socketmap server. The name of the table
        specifies inet:host:port:socketmap-name for a TCP-based server, or
        unix:pathname:socketmap-name for a UNIX-domain server. In both cases
        socketmap-name is the name of the socketmap.

        Wietse

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