A patch to fix this which is applicable to Mailman >= 2.1.15 and <= 2.1.22 is attached here. This fix has also been released as part of Mailman 2.1.23.
A patch to fix this which is applicable to Mailman >= 2.1.15 and <= 2.1.22 is attached here. This fix has also been released as part of Mailman 2.1.23.