Hi
Finally, i found the solution
Edit this file (make a backupo before;
/etc/mail/sendmail.cf
Find :
# SMTP daemon options
O DaemonPortOptions=Name=MTA
Add this line below
O DaemonPortOptions=Port=587, Name=MSA, M=E
Of course, u must reboot sendmail
/etc/init.d/sendmail restart
Regards
Seb