Support 'greenmail' as an imap vendor label, don't call ID when not supported

program/lib/Roundcube/rcube_imap.php

@@ -631,7 +631,7 @@ class rcube_imap extends rcube_storage
             return;
         }
 
-        if (($ident = $this->conn->data['ID']) === null) {
+        if (($ident = $this->conn->data['ID']) === null && $this->get_capability('ID')) {
             $ident = $this->conn->id(array(
                     'name'    => 'Roundcube',
                     'version' => RCUBE_VERSION,
@@ -642,7 +642,7 @@ class rcube_imap extends rcube_storage
 
         $vendor  = (string) (!empty($ident) ? $ident['name'] : '');
         $ident   = strtolower($vendor . ' ' . $this->conn->data['GREETING']);
-        $vendors = array('cyrus', 'dovecot', 'uw-imap', 'gimap', 'hmail');
+        $vendors = array('cyrus', 'dovecot', 'uw-imap', 'gimap', 'hmail', 'greenmail');
 
         foreach ($vendors as $v) {
             if (strpos($ident, $v) !== false) {

tests/Browser/bootstrap.php

@@ -202,10 +202,15 @@ class bootstrap
             rcube::raise_error(__METHOD__ . ': IMAP connection unavailable', false, true);
         }
 
-        $imap = rcmail::get_instance()->get_storage();
+        $rcmail     = rcmail::get_instance();
+        $imap       = $rcmail->get_storage();
+        $no_special = $rcmail->config->get('create_special_folders');
 
+        // Note: We do not expect IMAP server auto-creating any folders
         foreach ($imap->list_folders() as $folder) {
-            if (!$imap->is_special_folder($folder)) {
+            if ($folder != 'INBOX' && (!$no_special || !$imap->is_special_folder($folder))) {
+                // Note: GreenMail throws errors when unsubscribing deleted folder
+                // We'll ignore that for now
                 $imap->delete_folder($folder);
             }
         }