require authentication. The class now checks if the mail properties are
containing the property mail.user and uses the properties mail.user and
mail.password for creating an instance of the javax.mail.Authenticator which is
added to the javax.mail.Session used by the Mail class. If there is no
mail.user property the old behaviour is used.
git-svn-id: https://svn.libreccm.org/ccm/trunk@3727 8810af33-2d31-482b-a856-94f89814c4df
9f16494b9a