@nebulon Thanks for your response. I had read the documentation before. As far as I understand setting up the external SMTP server means that cloudron uses this (in the exemple smtp.forwardemail.net) to send emails instead of the internal SMTP server (my.domain.coop).
Before I setup the external server, my desktop clients were configured to send emails using my.domain.coop + my cloudron credentials for that particular mailbox.
Now it works either using:
the exact same config as before
using the settings from the external SMTP server provider, in that case, smtp.forwardemail.net + credentials provided by forward email *@domain.coop + password.
My question is:
If I keep using the same config as before for sending emails from my client, i.e. my.domain.coop + cloudron credentials, does Cloudron still somehow pass that on to the external SMTP server, or is it sent by cloudron internal smtp server?
Or am I missing something?