Syslog-ng: how to change a message before sending to a remote host

I'm using syslog-ng 1.6.8 on SLES 10. From this machine, I need to forward all events to the remote host 10.30.38.115. But preliminary I have to change messages a little bit, adding "MyMark" prefix to the end of the event. I tried the following:

source src {
       internal();
       unix-dgram("/dev/log");
};


destination editredirect { udp("10.30.38.115" port(514) template("<$PRI> $DATE $HOST $MSG MyMark\n") ); };

log { source(src); destination(editredirect); };

But it doesn't work. On the remote host, I don't receive these messages at all. Truth be told, I don't receive them even if I remove the template. The remote host is configured to accept incoming messages and it really does.

So, my question is how to tune syslog-ng.conf so that I could change messages before sending them to the remote host.

Update: solved

Here is how redirection is now organized:

Remote machine:

source src {
        #
        # include internal syslog-ng messages
        # note: the internal() soure is required!
        #
        internal();

        #
        # the default log socket for local logging:
        #
        unix-dgram("/dev/log");

        #
        # uncomment to process log messages from network:
        #
        udp(ip("0.0.0.0") port(514));
        tcp(ip("0.0.0.0") port(1470)); };

Local machine:

source src {
        #
        # include internal syslog-ng messages
        # note: the internal() soure is required!
        #
        internal();

        #
        # the following line will be replaced by the
        # socket list generated by SuSEconfig using
        # variables from /etc/sysconfig/syslog:
        #
        #unix-dgram("/dev/log");
        unix-stream("/dev/log");

        #
        # uncomment to process log messages from network:
        #
        #udp(ip("0.0.0.0") port(514));
};


destination editredirect { tcp("10.30.38.115" port(1470) template("<$PRI> $DATE $HOST $MSG MyMark\n")); };
log { source(src); destination(editredirect); };