I just started to test Virtualmin in last a few days, and have tested deployment on CentOS6, Debian 6 and Ubuntu 12.04. On all situation, I encountered the same problem: the script-installed Roundcube cannot send email.
I have SSL/TLS enabled on Postfix. My Mac Mail program, Usermin, and SquirrelMail all work without a single problem. Roundcube installation, login and receiving are OK. But once clicking send button, the sending takes forever and the interface hangs. Does anyone know what need be done for Roundcube to work?
Thanks in advance!