==== Required information ====
- iRedMail version (check /etc/iredmail-release): 0.9.3
- Linux/BSD distribution name and version: FreeBSD 10.2 jail
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): LDAP
- Web server (Apache or Nginx): NGINX
- Manage mail accounts with iRedAdmin-Pro? No
- Related log if you're reporting an issue:
====

I reinstalled iRedMail after fixing some permissions issues in jail management.
There is no errors anymore, but nothing works 'out-of-the-box'.
It seems that all components have trouble to access to MySQL databases.
For example, /var/log/sogo shows errors "could not open channel <MySQL4Channel..."

The databases are present in MySQL:
mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| amavisd            |
| iredadmin          |
| iredapd            |
| mysql              |
| performance_schema |
| sogo               |
| test               |
+--------------------+
8 rows in set (0.02 sec)

The users are present in MySQL:
mysql> select user,host from mysql.user;
+-----------+-------------------+
| user      | host              |
+-----------+-------------------+
| root      | 127.0.0.1         |
| root      | ::1               |
| amavisd   | localhost         |
| iredadmin | localhost         |
| iredapd   | localhost         |
| root      | localhost         |
| sogo      | localhost         |
| root      | mail.flytrace.com |
+-----------+-------------------+
8 rows in set (0.00 sec)

Some grants are present:
mysql> show grants for 'iredadmin'@'localhost';
+------------------------------------------------------------------------------------------------
------------------+
| Grants for iredadmin@localhost
                  |
+------------------------------------------------------------------------------------------------
------------------+
| GRANT USAGE ON *.* TO 'iredadmin'@'localhost' IDENTIFIED BY PASSWORD '*88E2910C47B9AE8E25B17DD1
A226072D2BB97AE1' |
| GRANT ALL PRIVILEGES ON `iredadmin`.* TO 'iredadmin'@'localhost'
                  |
+------------------------------------------------------------------------------------------------
------------------+
2 rows in set (0.01 sec)

mysql> show grants for 'iredapd'@'localhost';
+----------------------------------------------------------------------------------------------------------------+
| Grants for iredapd@localhost                                                                                   |
+----------------------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'iredapd'@'localhost' IDENTIFIED BY PASSWORD '*AC851CA84AF672FBF3C0CC5D02F7229128D831E9' |
| GRANT ALL PRIVILEGES ON `iredapd`.* TO 'iredapd'@'localhost'                                                   |
+----------------------------------------------------------------------------------------------------------------+
2 rows in set (0.00 sec)

mysql> show grants for 'sogo'@'localhost';
+-------------------------------------------------------------------------------------------------------------+
| Grants for sogo@localhost                                                                                   |
+-------------------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'sogo'@'localhost' IDENTIFIED BY PASSWORD '*03FA2C7B49675D711B3515FABE34314FA82E6B5F' |
| GRANT ALL PRIVILEGES ON `sogo`.* TO 'sogo'@'localhost'                                                      |
+-------------------------------------------------------------------------------------------------------------+
2 rows in set (0.00 sec)

Before getting all grants for anybody, I would ask the developers if they have any idea about a possible reason of my problem...