How can I check for errors, I did everything you listed and it still does not work.
I created a DNS A record for webmail.example.com with internal IP.
then I did the Virtual host record on the mailserver (hostname mail.example.com)
then I followed the rest of steps for squirrelmail except replacing with roundcube.
Externally it still does not work.
I also realized that I made 2 modifications to roundcube.. first was
nano /etc/apache2/conf.d/roundcube.conf
which I added
<VirtualHost 1.2.3.4:80>
DocumentRoot /usr/share/roundcube
ServerName webmail.example.com
</VirtualHost>
The second I created through webmin a virtual host on the apache server for the directory of /var/www/roundcube
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