You would also have to delete this section of the vhost conf (/usr/local/apache/conf.d/vhosts/yourdomain.com.conf):
<VirtualHost 111.111.111.111:80>
ServerName webmail.yourdomain.com
<IfModule mod_proxy.c>
ProxyRequests Off
ProxyPreserveHost On
ProxyVia Full
ProxyPass / http://127.0.0.1:2095/
ProxyPassReverse / http://127.0.0.1:2095/
<Proxy *>
AllowOverride All
</Proxy>
</IfModule>
<IfModule mod_security2.c>
SecRuleEngine Off
</IfModule>
</VirtualHost>
(For completeness, you do this for both the plain .conf and the .ssl.conf files.)