thanks again,
but i checked and nothing wad changed
in configuration/mail, i've :
- change mail access
** pop3 and pop3s
** imap and imaps
** https
- filters
- mail reception
** mail recovery : standar (smtp) or ETRN or Multipoint
** smtp authentification : disabled or SMTP over SSL
now its configured with standard mail recovery and smtph auth disabled, and client always needs to use SSL
i know its dangerous, but i've some application which needs this and until i fix another problem, i need to disable SMTP SSL
thanks again