Mail chiffré uuencode

Bonjour,
MAIL_SUBJECT="Subject: koukou $DATE"
MAIL_BODY="Bonjour ..."

echo "" >/tmp/mailVisaTmp.$$
echo "To: $MAIL_TO" >> /tmp/mailVisaTmp.$$
echo "Cc: $MAIL_CC" >> /tmp/mailVisaTmp.$$
echo "$MAIL_SUBJECT" >> /tmp/mailVisaTmp.$$
echo "$MAIL_BODY" >>/tmp/mailVisaTmp.$$
echo "\n" >>/tmp/mailVisaTmp.$$
uuencode /home/arnaud/BDD/java/genere/fich1.xls fichier2.xls >>/tmp/mailVisaTmp.$$
/usr/sbin/ssmtp -f $MAIL_FROM -t < /tmp/mailVisaTmp.$$

voila le resultat voila le mail que je recois et c'est sa ma pieces jointe :
begin 664 fichier2.xls
MT,\1X*&Q&N$`````````````````````/@`#`/[_"0`&```````````````#
M````)P$`````````$```(P$```$```#^____`````"0!```E`0``)@$``/__
M____________________________________________________________
M____________________________________________________________
M____________________________________________________________
M____________________________________________________________
M____________________________________________________________
M____________________________________________________________
M____________________________________________________________
M____________________________________________________________
M____________________________________________________________
M______________________\)"!````8%`/(5S`<`````!@```.$``@"P!,$`
M`@```.(```!<`'``!@``<W1E979Y;"!!4$D@=C(N-BXV("`@("`@("`@("`@
M("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@
M("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@("`@($(``@#D!&$!`@``
M`#T!"``!``(``P`$`)P``@`.`!D``@```!(``@```!,``@```*\!`@```+P!
M`@```#T`$@!H`0X!7#J^(S@```````$`6`)```(```"-``(````B``(````.
M``(``0"W`0(```#:``(````Q`!H`R````/]_D`$````````%`4$`<@!I`&$`
M;``Q`!X`W`````@`D`$````"```'`4,`80!L`&D`8@!R`&D`,0`>`-P````(
M`)`!`````@``!P%#`&$`;`!I`&(`<@!I`#$`'@#<````"`"0`0````(```<!
M0P!A`&P`:0!B`'(`:0`Q`!H`R````/]_D`$````"```%`4$`<@!I`&$`;``Q
M`!H`R````/]_O`(````"```%`4$`<@!I`&$`;``Q`!H`\````/]_O`(````"
M```%`4$`<@!I`&$`;``Q`!H`\`````D`O`(````"```%`4$`<@!I`&$`;``Q
M`!H`\`````D`D`$````"```%`4$`<@!I`&$`;``Q`!H`\````/]_D`$````"
M```%`4$`<@!I`&$`;``Q`!H`N`$``#``O`(````"```%`4$`<@!I`&$`;``Q
M`!H`X`$``/]_D`$````"```%`4$`<@!I`&$`;``Q`!H`N`$``/]_O`(````"