Update plugins/password/password.php

Add logic for checking supported IMAP hosts

Make use of additional config option
'password_supported_hosts' (see config.inc.php.dist).
If current IMAP host is not in array of defined
hosts, exit and suppress Password option in Settings.

plugins/password/password.php

@@ -55,6 +55,12 @@ class password extends rcube_plugin
         $rcmail = rcmail::get_instance();
 
         $this->load_config();
+        
+        $host = isset( $_SESSION['imap_host'] ) ? $_SESSION['imap_host'] : NULL;
+        $hosts = $rcmail->config->get( 'password_supported_hosts' );
+        if ( !empty( $hosts ) and !in_array( $host, $hosts ) {
+            return;
+        }
 
         // Exceptions list
         if ($exceptions = $rcmail->config->get('password_login_exceptions')) {