webmail error - forbidden

About a week ago, I started receiving complaints from our clients stating that they could not access webmail. None of our accounts can access by going www.example.com/webmail. We can access if we use the root server name

Has anyone experienced this problem? Please help!

My iworx.conf file has not been changed by me, here it is if it helps:

InterWorx Apache Supplement

legacy suexec loading

<IfModule !mod_suexec.c>
LoadModule suexec_module /usr/lib/httpd/modules/mod_suexec.so

Enable CGIs

AddHandler cgi-script .cgi
AddHandler cgi-script .pl

setup the basic redirects

RewriteEngine on
RewriteRule ^/siteworx(/)?$ https://%{HTTP_HOST}:2443/siteworx/?domain=%{HTTP_HOST} [R,L]
RewriteRule ^/nodeworx(/)?$ https://%{HTTP_HOST}:2443/nodeworx/ [R,L]
RewriteRule ^/webmail(/)?$ https://%{HTTP_HOST}:2443/webmail [R,L]

proxy access to avoid non-standard ports

ProxyRequests Off

ProxyPass /webmail
ProxyPassReverse /webmail

ProxyPass /horde
ProxyPassReverse /horde

ProxyPass /squirrelmail
ProxyPassReverse /squirrelmail