Postfix problem

[kilburn]

Trust me, it's not a postfix problem. The problem is that, as your management software doesn't identify as a user, postfix applies the usual checks it does when an external mailer tries to send mail to it.

One of this checks is a hostname check (all external mailers MUST have valid hostnames, and use them in the "EHLO" smtp command). Your management software uses "sedepos" as hostname, which obviously is not a fqdn. Therefore, postfix rejects this delivery attempt with a "Helo command rejected: need fully-qualified hostname" error.

The easiest and safest way to correct this is making the management software identify properly as a user. There are other options though, such as deactivating this hostname check in postfix. To do this, remove "reject_non_fqdn_sender," from the "smtpd_sender_restrictions" in /etc/postfix/main.cf