Our main mail email server has been upgraded:
- Linux distribution was upgraded from rom Debian Squeeze (Debian 6.0.7) to Debian Wheezy (Debian 7.0). This means:
- new libc, kernel
- new postfix, courier POP and Courier IMAP daemons
- new bind daemon
- new ssh daemon
- We used this upgrade as an opportunity to migrate the email domains and users database to the new database server; and
- We uninstalled all databases form the email server (freeing up RAM, disk and CPU resources in the process).
Overall we are very happy with the result.