Zimbra MTA inbound?


Renowned Member
Aug 13, 2017
Recently moving from pure postfix email server to zimbra, really want to have the web part of emails and calendars. Before I had postfix on ubuntu and proxmox PMG filter as my relay, I was looking though the zimbra config and found the master.cf.in to change the SMTP port to 27 so it can receive inbound email from proxmox PMG (if it has port 25 the same as PMG it will say a loop because the PMG filter hostname is mail.domain.com same as zimbra so that why i need to change the port)
as changing the port and reboot i can telnet the port which is good, but cannot receive the email
Im not sure if anyone has had any experience with zimbra and PMG as for the inbound, because outbound is working.
This is the error im getting on the PMG filter

Anonymous TLS connection established from mail.clientdomain.com[190.145.xx.xx: TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)
Nov 11 13:02:46 mail postfix/smtpd[15675]: NOQUEUE: reject: RCPT from mail.clientdomain.com[190.145.xxxxx]: 454 4.7.1 <sistemas@mydomain.com>: Relay access denied; from=<sistemas@clientdomain.com> to=<sistemas@mydomain.com> proto=ESMTP helo=<mail.clientdomain.local>

i assume its because zimbra is rejecting it, but i changed the port on zimbra to 27 to accept it so not sure what else is needed?

Thank you
Did you set your relaying, relay domains and network correctly on your PMG?
Thanks for the reply, yes correct i know PMG is not the issue because i have another email server behind it and it works but i was wondering if someone had a zimbra with PMG and was working for inbound?


The Proxmox community has been around for many years and offers help and support for Proxmox VE, Proxmox Backup Server, and Proxmox Mail Gateway.
We think our community is one of the best thanks to people like you!

Get your subscription!

The Proxmox team works very hard to make sure you are running the best software and getting stable updates and security enhancements, as well as quick enterprise support. Tens of thousands of happy customers have a Proxmox subscription. Get yours easily in our online shop.

Buy now!