Hi all,
I've installed CE on Ubuntu 20.04. I can login to the web interface. Everything appears to work. Sending an email results on no receipt on the other end, whether the address is local to the CCE server or if it's remote to say somewhere like Gmail. I get no delivery failure messages. Nothing. I do get local on-box email delivery to the root account from things like cron, but that's it. All accounts say they sent email just fine, but it never shows up at the destination.
Any hints that can point me in the right direction?
Access the server via SSH and check the log file /var/log/carbonio.log, there it should say what is going on. If you do:
su - zextras mailq
your sent e-mails will probably be there in the queue.
When the user interface says "Sent" it only means that Postfix put the outgoing e-mail in a queue. What happens after that is recorded in the log file.