1 files changed, 7 insertions, 1 deletions
diff --git a/lib/net/imap.rb b/lib/net/imap.rb
index 6f1a578144..46e8f201a1 100644
--- a/lib/net/imap.rb
+++ b/lib/net/imap.rb
@@ -1282,9 +1282,15 @@ module Net
     end
 
     def fetch_internal(cmd, set, attr)
-      if attr.instance_of?(String)
+      case attr
+      when String then
         attr = RawData.new(attr)
+      when Array then
+        attr = attr.map { |arg|
+          arg.is_a?(String) ? RawData.new(arg) : arg
+        }
       end
+
       synchronize do
         @responses.delete("FETCH")
         send_command(cmd, MessageSet.new(set), attr)