howto use the mailer.local ?


my mail log say "permision deny" when mail.local try to lock the user mail file :

Dec 8 17:54:59 localhost mail.local: setreuid(0, 501): Operation not permitted (r=501, e=501)
Dec 8 17:54:59 localhost sendmail[2058]: fB8Gswn02057: to=, ctladdr= (501/20), delay=00:00:01,

the configuration of the mailer.local of sendmail is :

Mlocal, Path=/usr/libexec/mail.local, Flags=lsDFMrmn:/|wA9q,
Sender=10, Recipient=20, Argv=mail -d $u

if anyone have a idea?