I'm trying to change the title of my webpages on my roundcube email server but I don't know how or where to alter the roundcube object pagetitle.
<title><roundcube:object name="pagetitle" /></title>
You're looking for (roundcube root)/program/localization/(then the language you choose)/labels.inc
More specifically the pagetitle uses the $config['product_name'] on the config.inc.php in the config folder