MailHost.send (in Zope 2.8) will not be able to parse headers if the mail_text
is passed as a unicode. In such case, convert to string explicitly.



git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@32139 20353a03-c40f-0410-a6d1-a30d3c3de9de