/usr/share/postfixadmin/model/ is in postfixadmin 3.0.2-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/postfixadmin/model/AdminHandler.php
/usr/share/postfixadmin/model/AdminpasswordHandler.php
/usr/share/postfixadmin/model/AliasHandler.php
/usr/share/postfixadmin/model/AliasdomainHandler.php
/usr/share/postfixadmin/model/CliDelete.php
/usr/share/postfixadmin/model/CliEdit.php
/usr/share/postfixadmin/model/CliHelp.php
/usr/share/postfixadmin/model/CliScheme.php
/usr/share/postfixadmin/model/CliView.php
/usr/share/postfixadmin/model/Config.php
/usr/share/postfixadmin/model/DomainHandler.php
/usr/share/postfixadmin/model/FetchmailHandler.php
/usr/share/postfixadmin/model/MailboxHandler.php
/usr/share/postfixadmin/model/PFAHandler.php
/usr/share/postfixadmin/model/VacationHandler.php