Fresh installation of 1.9.4 today on of CentOS 7 VPS (Vultr). I did not install dovecot/postfix, I use a dedicated email provider instead.
So when I went to create a new website I get to the (new?) "Creating mail child domain.." step and then the process errors out:
Error message: [Errno 2] No such file or directory: '/etc/dovecot/dovecot.conf' 
Obviously this mail subdomain should be an optional step, or maybe even detected and skipped silently. Let me know if there's anything I can do to create new website without this step, or if I have to wait for the next update.
.....I'm curious to see if 1.9.4 clears up some ghosts in the machine that I haven't been able to figure out in 1.9.3.