transport/30_exim4-config_dovecot_deliver

#
# dovecot deliver
#
dovecot_delivery:
  driver = pipe
  command = /usr/lib/dovecot/deliver
  message_prefix =
  message_suffix =
  log_output
  delivery_date_add
  envelope_to_add
  return_path_add
  temp_errors = 64 : 69 : 70: 71 : 72 : 73 : 74 : 75 : 78

update-exim4.conf.conf

-dc_localdelivery='mail_spool'
+dc_localdelivery='dovecot_delivery'

reasoning:

• updates indexes for fast pop3/imap access on delivery (indexes unusable otherwise)
• allows usage of dovecot's sieve and managesieve implementation