I have installed iRedMail and it works just fine. That is, until the server has an uptime of about a day. After this time I simply receive no mails, nor can I send any. I have to reboot to workaround this. This is not really a durable option obviously.

==== Required information ====
- iRedMail version: 0.8.7
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Linux/BSD distribution name and version: Ubuntu 14.04
- Related log if you're reporting an issue: I'm not sure which log to look into.
====

The server is located on a Digital Ocean VPS with the following specifications:
512 MB Memory
1 Core Processor
20 GB SSD Disk
1 TB Transfer

If more info is required, do ask.