allow functional email account to send mails from external/internet

[liszca]

I want my service account to be able to send me status messages from external/internet.

That wasn't an problem before the Proxmox Mail Gateway but now I get those message as undeliverable.

Do I have to setup that one service account on the Proxmox Mail Gateway?

Something like in this guide:
https://medium.com/yavar/send-mail-using-postfix-server-bbb08331d39d