Is it possible to set up Roundcube running only on local network without domain?

[n3b3lman]

I have been trying to set up Roundcube with postfix and dovecot for a long time on a local vm LAMP server. I have managed to make it possible to log in to Roundcube and view local user emails I have sent from the linux command line, but I can't send any emails from Roundcube. So I'm wondering wether is it even possible to set up roundcube locally only.

[JohnDoh]

As long as your SMTP server is working then Roundcube should be able to send emails, I guess you are getting an error of some kind?