Install it setuid root as described here http://wiki.dovecot.org/LDA.
Alexander
Gert Cuykens wrote:
> How can i give lda dovecot permision to set user and goup id to 5001
>
> dovecot unix - n n - - pipe
> flags=DRhu user=mail:mail argv=/usr/lib/dovecot/deliver -f ${sender}
> -d ${recipient}
