can't access webmail interface from drupal multisites

[qiubosu]

in /var/www, there is a softlink webmail -> /usr/share/squirrelmail. browse http://localhost/webmail can go to the webmail login page. after setup drupal multisites (codebase in /var/www/site-1.com/web), add webmail -> /usr/share/squirrelmail softlink under both /var/www/site-1.com/web and /var/www/site-2.com/web and include /usr/share/squirrelmail in open_basedir in ispconfig 3 control panel, but can't access the webmail interface from both sites. why? how to solve it?

[falko]

Are there any errors in Apache's error log?

[qiubosu]

hi falko,

it related to my another post titled "Length of "PHP open_basedir" field, in ISPConfig 3 contral panel" as below:

Originally Posted by qiubosu

in ispconfig 3 control panel, go to Sites -> click a Domain -> click Options. want to type in more directories to be included in the "PHP open_basedir" field, but not allowed, because of the constraint of the length of the text input. how can adjust that length? can type into the "Custom php.ini settings" text field below this "PHP open_basedir" field? if yes, can you give an example with the correct syntax? (the open_basedir in /etc/php5/apache2/php.ini is disabled).

by the way, i update the database dbispconfig, table web_domain, field php_open_basedir's type from mediumtext to longtext, but the field "PHP open_basedir" in ISPConfig 3 control panel still not allow me to type into more included directory.

the apache error says there is some relevant files missing because the "PHP open_basedir" field in control panel can't allowed more directories to be included.