===== LXC correct domain for Postfix =====
When using ''postfix'' within a Proxmox Container (LXC), Postfix might source a wrong domain and just appends ''.localdomain'' to the sender/receiver address. To change that edit ''/etc/postfix/main.cf'' and change the line ''mydomain = '':
<code bash>mydomain = <yourdomain></code>
If not changing that, .localdomain would be used although the ''/etc/hosts'' contains the correct domain.