Target always subscribed to all the filters

[rakdeFR]

I read the doxygen doc, and I read this part:
"Filters should be instantiated only after outputs are instantiated, as they automatically search for and publish to targets."

So I thought if I'm doing so, I won't have all the target linked (subscribed?!) to the filters.
Something like this in order to subscribed only the mailTarget to the mailFilter:
int main(int argc, const char *argv[])
{
    LOGOG_INITIALIZE();

    // args: log_level, sFileName, nLineNumber, sGroup, sCategory, sMessage, dTimestamp (0.0f)
    MailFilter * mailFilter = new MailFilter();
    mailFilter->Group(_LG("Mail"));

    {  
        logog::Cerr err;
        logog::GetDefaultFilter().Group(_LG("DefaultX"));
        logog::GetDefaultFilter().PublishTo(err);

        MailTarget mailTarget("XXXX");
        mailFilter->PublishTo(mailTarget);
...


But I have the logog::Cerr err subscribe to the mailFilter too!

What's wrong in my code?

Thank you