I fond the solution.
While here (
http://code.google.com/appengine/docs/java/mail/overview.html#Attachments )
says that "text/plain" mime type is the one to attach a .txt file, I changed
the mime type to "application/octet-stream" and now works fine.
I just changed this line:
DataSource src = new ByteArrayDataSource(new
ByteArrayInputStream(buff.toString().getBytes()), "text/plain");
with this:
DataSource srcTextFile = new
ByteArrayDataSource(buff.toString().getBytes("UTF-8"),
"application/octet-stream");
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