I was able to setup PMG yesterday and my mailcow behind it. Right now I run into the following issue that I get a reject on a receiving server ehlo/helo domain.
F.e. my PMG got the hostname mailgateway.internal.local right now.
My 1st: Is it just enough to change the hostname in...
I have a question regarding Helo checks.
I would like to change our Helo name to something different then our hostname of proxmox. The reason is that some mailservers who force Helo check are blocking our e-mails currently they see our internal hostname of proxmox server.