New Zimbra install; receiving mail works fine, as does sending to most places. However, some recipient hosts are bouncing our mail with:
Helo command rejected: need fully-qualified hostname
There's no split DNS configured; I've got the following in /etc/hosts (Ubuntu):
192.168.1.220 zimbra.company.com zimbra
"hostname" returns zimbra.company.com too. Where can I set the FQHN for Zimbra to use?