[Dovecot] deliver

[Il Neofita]

I am new and for sure I did something stupid

I trying to use dovecot with sendmail
but I am receiving this error

teststat deliver(usertest): net_connect(/var/run/dovecot/auth-master)
failed: Permission denied
stat=Deferred: local mailer (/usr/libexec/dovecot/deliver) exited with
EX_TEMPFAIL

on send mail I added
FEATURE(`local_procmail', `/usr/libexec/dovecot/deliver',`deliver -d $u')
MODIFY_MAILER_FLAGS(`LOCAL', `-f')
MAILER(procmail)dnl

I am using the nis, but I do not think that this is the problem since I am
able to login with imaps

# 1.0.5: /etc/dovecot.conf
protocols: imaps
login_dir: /var/run/dovecot/login
login_executable: /usr/libexec/dovecot/imap-login
mail_location: maildir:/var/mail/newmail/%u:INDEX=/var/indexes/newmail/%u
mail_debug: yes
auth default:
  passdb:
    driver: pam
    args: session=yes dovecot
  userdb:
    driver: passwd
  socket:
    type: listen
    client:
      path: /var/run/dovecot/auth-client
      mode: 432
    master:
      path: /var/run/dovecot/auth-master
      mode: 384