For Virtual Hosting Domains
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If you are hosting mutiple domains with virtualHost directive,
add following lines in httpd.conf to access openwebmail login screen for each domain.
ex) http://domain.com/webmail
# Open Webmail ScriptAlias, Alias
ScriptAlias /webmail "/var/www/cgi-bin/openwebmail/openwebmail.pl"
Alias /data "/var/www/data"