make send text mail work excellently

git-svn-id: https://svn.apache.org/repos/asf/james/hupa/trunk@1522301 13f79535-47bb-0310-9956-ffa450edef68
add user label, yet issue46 occur

git-svn-id: https://svn.apache.org/repos/asf/james/hupa/trunk@1522302 13f79535-47bb-0310-9956-ffa450edef68