Webmail is showing blank page.

Problem: In plesk, sometime, after php upgrade if you take “http://webmail.domian.com” via browser, you will get blank page.

Check the apache logs. If you find any logs as follows:

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Fatal error: require_once() [function.require]: Failed opening required ‘Horde/String.php’ (include_path=’/usr/share/psa-horde:/usr/share/psa-horde/pear:.’) in /usr/share/psa-horde/lib/Horde/Browser.php on line 4
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Perform following steps:

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1. Copy Webmail VirtualHost entry from “/etc/httpd/conf.d/zz010_psa_httpd.conf” to “/etc/httpd/conf.d/webmail.conf”.

2. Find the “php_admin_value include_path” value from the “/etc/httpd/conf.d/webmail.conf” file.

3. Replace it with following entry:

php_admin_value include_path “/usr/share/psa-horde/lib:/usr/share/psa-horde:/usr/share/psa-horde/pear:.

Note : You should change this value for all “php_admin_value include_path”.

4. Restart apache and plesk services.
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Now, access the URL “http://webmail.domian.com” 🙂