==== Required information ====
- iRedMail version (check /etc/iredmail-release): 0.9.6 MARIADB edition
- Linux/BSD distribution name and version: Ubuntu 16.04
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):  MySQL (MariaDB)
- Web server (Apache or Nginx): nginx
- Manage mail accounts with iRedAdmin-Pro? Yes
- Related log if you're reporting an issue: 
====

This is a new install. I was trying to help a user get set up and I needed to see the dovecot-imap log. To my surprise, all the dovecot logs were empty:

t# ll /var/log/dovecot*
-rw------- 1 syslog vmail     0 May  7 06:27 /var/log/dovecot-imap.log
-rw-r--r-- 1 syslog adm   54057 May  7 06:18 /var/log/dovecot-imap.log.1.gz
-rw------- 1 syslog vmail     0 May  7 06:27 /var/log/dovecot-lda.log
-rw-r--r-- 1 syslog adm    7155 May  7 06:23 /var/log/dovecot-lda.log.1.gz
-rw------- 1 syslog vmail     0 May  7 06:27 /var/log/dovecot.log
-rw-r--r-- 1 syslog adm     692 May  5 19:29 /var/log/dovecot.log.1.gz
-rw------- 1 syslog vmail     0 May  7 06:27 /var/log/dovecot-pop3.log
-rw-r--r-- 1 syslog adm   16874 May  7 06:25 /var/log/dovecot-pop3.log.1.gz
-rw------- 1 syslog vmail     0 May  7 06:27 /var/log/dovecot-sieve.log
-rw-r--r-- 1 syslog adm     343 May  6 11:46 /var/log/dovecot-sieve.log.1.gz

Seems they were owned by vmail and had permissions of 600, so syslog couldn't write to them.

Changing ownership fixed the issue, but hopefully there's a better fix:

# chown syslog /var/log/dovecot*

# ll /var/log/dovecot*
-rw------- 1 syslog vmail 12962 May  9 19:05 /var/log/dovecot-imap.log
-rw-r--r-- 1 syslog adm   54057 May  7 06:18 /var/log/dovecot-imap.log.1.gz
-rw------- 1 syslog vmail   622 May  9 19:04 /var/log/dovecot-lda.log
-rw-r--r-- 1 syslog adm    7155 May  7 06:23 /var/log/dovecot-lda.log.1.gz
-rw------- 1 syslog vmail     0 May  7 06:27 /var/log/dovecot.log
-rw-r--r-- 1 syslog adm     692 May  5 19:29 /var/log/dovecot.log.1.gz
-rw------- 1 syslog vmail  2744 May  9 19:05 /var/log/dovecot-pop3.log
-rw-r--r-- 1 syslog adm   16874 May  7 06:25 /var/log/dovecot-pop3.log.1.gz
-rw------- 1 syslog vmail     0 May  7 06:27 /var/log/dovecot-sieve.log
-rw-r--r-- 1 syslog adm     343 May  6 11:46 /var/log/dovecot-sieve.log.1.gz

Besides setting a cron to chown those files is there a fix?