add support for optional plugins

JohnDoh

2014-08-16 0b799bee90d897d052d0310300a377e067e1fa34

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require ["envelope","fileinto","subaddress"];
if envelope :user "To" "postmaster"
{
    fileinto "postmaster";
    stop;
}
if envelope :detail :is "To" "mta-filters"
{
    fileinto "mta-filters";
    stop;
}