[XeTeX] Subject prefix back on the XeTeX mailing list

[Arthur Reutenauer]

        Hello,

  After some discussion we decided to put the subject line prefix back;
Karl just made the change and also set Mailman’s “munge from” option
(https://wiki.list.org/DOC/Mailman%202.1%20List%20Administrators%20Manual#line-163).

        Best,

                Arthur