[Mailman-Users] a question about content-filtering

I configured the list and default values accourding to the following values.

I filled the filter_filename_extensions and pass_filename_extensions parameters for filtering attachments.

the values are listed below: filter_filename_extensions = """exe bat cmd com pif scr vbs cpl"""

pass_filename_extensions = """doc xls xml xlw ppt pps pdf php gz gif jpg jpeg bmp png htm html txt rtf rar zip"""

But i have a problem, if someone sends a document with file name qwe.JPG mailman doesn't send the attachment. I couldn't add the Capital letter extensions. Mailman converts them to lower letter.

Do you have any advise about it?